Students and Teachers Forum
Here, n(U) = 100% n(F) = 60% n(S) = 50% n(FUS)' = 10 So, n(FUS) = n(U) - n(FUS)' = 90% Again, n(FUS) = n(F) + n(S) - n(F∩S) or, 90 = 60 + 50 - n(F∩S) or, 20% = n(F∩S) Now, 20% of total .....
Here, n(C) = 75% of 500 = 375 n(C∩V) = 20% of 500= 100 no(V) = 10% of 500 = 50. i) We know, n(V) = no (V) + n(C∩V) = 100 + 50= 150 ii) n(V') = n(U) - n(V) = 500 - 150 =............ Try to draw .....
Here, n(U) = 75 no(N) = 30 no(S) = 25 n(NUS)'=10 We know, n(NUS) = n(U) - n(NUS) = 75 - 10 = 65. Again, n(NUS) = no(N) + no(S) + n(N∩S) or, 65= 30 + 25 + n(N∩S) Solve and find n(N∩S). Try to plot in .....
Here, x = y [ Since, angle on same arc BC.] Now, ∡OCB = ∡OBC = 65o [ As, OB = OC.] ∡ACB = 90o [ Since, AB is a diameter.] So, ∡A + ∡ACB .....
Here, in triangle ABC, ∡A + ∡B + ∡C = 180o or, 38o + 90o + x = 180o [ Since, AC is a diameter.] Find x. Again, y = 2x [ As, central angle is twice of inscribed .....
Here, ∡ROQ = 2 of ∡P [ Since, central angle is double of inscribed, on same arc BC.] = 80o. In triangle OQR, ∡OQR = ∡ORQ = x [ .....
In triangle AOB, 30 + ∡AOB + 30 = 180o [Since, OA = OB.] or, ∡AOB = 120o. Again, x = 1/2 of ∡AOB [ Since, inscribed angle is half of central angle on same .....
‘म को हुँ’ निबन्धमा निबन्धकारले आफूलाई निम्न रुपमा चिनाएकी छन्ः
Here, First expression = x3y - xy2 = xy(x2 - y) Second expression = x2 + xy = x( x + y) HCF = common factors = .....
Look at the .....
The age-specific fertility rate (ASFR) is the number of live births per 1,000 women in five year age groups per year. ASFR= Number of live births to women in specified age groupNumber of women in same age group .....
Here, As we know, ∡A = 1/2 of ∡BOC [ Since, inscribed angle is half of central angle on same arc BC,] or, x = 1/2 of 80o Calculate .....
Here, 5cos2x + 2cos2x/2 + 1=0 or, 5( 2cos2x - 1) + cosx + 1 + 1 = 0 [ Since, cos2A = 2cos2A - 1 & 2cos2A/2 = 1 + cosA.] or, 10cos2x + cosx- 3 = 0 or, 10cos2x + 6cosx - 5cosx - 3 = 0 Now factorize and find .....
Here, ∡BOC = 2 of ∡A [ Since, central angle is double of inscribed, on same arc BC.] = 70o. In triangle OBC, ∡OBC = ∡OCB = x [ .....
The period between two new moons is called .....
Here, Ref.∡AOB = 360 - 140 = 220o We know, ∡C = 1/2 of ref.∡ AOB [ Can you say the reason?] or, x = 1/2 of 220o Calculate .....
Antonyms consists = exclude killings = .....
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i) For wave A, Frequency = 2 Hz. For wave B, Frequency = 1 Hz. ii) For wave A, Wave length = 1m So, speed of wave = wavelengt x frequency = 1m x 2Hz = 2m/s. Similarly find next. iii) Wave .....
If an organism has two copies of the same allele, for example AA or aa, it is homozygous for that trait. If the organism has one copy of two different alleles, for example Aa, it .....
When one tastes salt, the saltiness taste receptors respond specifically to the sodium cation. That type of taste receptor is a cation channel. This is why lithium and potassium cations also taste salty (though they also stimulate other receptors .....
Sodium hydrogen phosphate ( Na2HPO4 ), when reacts with a base, it donates one H+ ion and the reaction forms a salt and water. Na2HPO4 + NaOH --> Na3PO4 + H2 O We know, in a reaction, the reactant that donates H+ ion is .....
Sodium acetate (CH3COONa) is a salt in solid state and can't be regarded as an acid or base in anhydrous or molten form.
Although, being an ionic compound, sodium acetate dissociates in water to produce sodium ion Na+ and acetate ion .....
There are mainly 4 types of indicators. Natural, synthetic,olfactory and universal indicator. •Indicator is the substance which indicates that a solution is acidic or basic in nature. •Universal indicator is the mixture .....
A base that reacts with an acid and is itself soluble in water is called water soluble base. For example: NaOH (sodium hydroxide) reacts with acid and it can be dissolved in water. It is a water-soluble base. Likewise, most bases including bases .....
Given: There are 3 arithmetic means. first term = a. last term = b. first mean = 10 third mean = 20 Let the common difference be 'd'. We know, nth mean = a + nd first mean = a + 1d = 10 or, a = 10 - d third mean .....
Here, first term (a) = 4 last term (l) = b number of arithmetic means (n) = 6 fifth mean (m5) = 14 We know, common difference (d) = (l - a) / (n + 1) or, d = (b - 4) / (6 + 1) = (b - .....
Dear Shraddha, post your question in a meaningful way so that we can help you solving your .....
A multi-party system is the system of governance in which the political parties contest the election. The political parties that may secure the majority in the legislature may form the executive. Some of the provisions that should be added to make .....
Here, LHS = sin(α + β) - 2sinα + sin(α - β)cos(α + β) - 2cosα + cos(α - β) = [sin(α + β) + sin(α - .....
The scientific name of Panch Aunle plant is Dactylorhiza .....
Look at the following mixture of husk and rice. You can easily separate husk from rice. Husk is unevenly (unequally) distributed in rice. Due to this reason, mixture of husk in rice. is called as heterogeneous .....
After fertilization, you quickly moved into your first major stage of development, and your parents referred to you as an embryo, which is the name given to an unborn baby for the eight weeks following .....
The process of increasing in size is called growth. When you were born you were small and now are much bigger this is because of .....
Uses of fungi: 1. Used as food. eg. mushroom. 2. used in food industry - yeast . 3. used as medicine - .....
Hydrogen is prepared in laboratory by the action of dilute sulphuric acid on granulated zinc. If copper sulphate is added to the above reactants, the reaction speeds up. So, to speed up the reaction we add .....
Here, Total no.of possible outcomes = 15 -5 + 1 = 11 = n(S) No.of Square number or an even number card = 6 So, the probability of getting a square number or an even number card while drawing a flash card the set of cards numbered from .....
Chlorination of water: It is the chemical process of purification of water. Germs in the water are responsible for spreading of cholera, dysentery, typhoid and jaundice. To protect ourselves from germs and other harmful organisms,we need to add a .....
Here is an example, please look it and try your question: Question: Find the equation of a circle which passes through the points (2,3) and (-1,2) and its Centre lies on the straight line 2x-3y+1=0. Solution: ..................(B) Now solve (A) .....
Some of the differences between the temperate oceanic climate and tropical desert climate are: temperate oceanic climate tropical desert climate Oceanic climates have cool but not cold winters and warm summers The climate of .....
A development plan is a well-planned document. It considers the overall strategy for the proper planning and sustainable development of an area and generally consists of a written statement and accompanying maps. The plan usually includes the .....
Human development index symbolise the overall status of the society or of the community. It is a measurement of the life expectancy, expected years of schooling, mean year of schooling, Gross National Income and others. Calculation of the index .....
HCl + KOH→KCl + H2O This reaction is a neutralization reaction and occurs when an acid (HCl) reacts with a base .....
a) Mg + H2SO4 → MgSO4 + H2 b) 2 HCl + Na2CO3→ 2 NaCl + CO2 + H2O c) HCl + NaOH → NaCl + H2O d) NaOH+ H2O → Na+ + OH- e) NaOH + CO2 → .....
Indicators gives us an idea whether a solution is acidic or basic. meyhl orange,phenolphtalein, eosin methyl orange changes its colur to pink in base and yelow in acid phenolphtalein is red in acid nd colorless in basic .....
Here, a = 3p + 2q , b = 7p - 6q, m = 3 & n = 1. Ues the formula: i) Internally: (m.b + n.a)/(m + n) ii) Externally: (m.b - n.a)/(m - .....
Here, position vectors OP = 2a⃗+3b⃗ and vector OQ = - a⃗+2b⃗ and m:n = 5:2. We have section formula, Vector OR = ( m.vector OP - n.vector OQ) / ( m - n) Use values of vector OQ & OP from above and find .....
Here, The given points are M(3, 5) andN (-1, -1). The position vectors of M and N are OM vector = 3i + 5j and ON vector = - i - j Q is the mid-point of MN, so position vector of Q; OQ vector = (OM vector + ON vector)/2 OQ vector = (3i + .....
Here, position vectors OA = i⃗-3j⃗ and vector OB = 2i⃗+6j⃗ and m:n = 3:1. We have section formula, Vector OC = ( m.vector OB + n.vector OA) / ( m + n) Use values .....