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For what value of n, are the nth terms of two A.Ps 63, 65, 67,.... and 3, 10,17,..... equal? Mathematics CBSE class 10 20171 AnswerHow many terms of an A.P. 9, 17, 25, .... must be taken to give a sum of 636? Mathematics CBSE class 10 20171 AnswerIf the ratio of the sum of the first n terms of two A.Ps is (7n + 1) : (4n + 27), then find the ratio of their 9th terms. Mathematics CBSE class 10 20171 AnswerIf the distances of P(x, y) from A(5, 1) and B(-1, 5) are equal, then prove that 3x = 2y. Mathematics CBSE class 10 20171 AnswerIf the roots of the equation (a^2 + b^2) x^2 – 2(ac + bd) x + (c^2 + d^2) = 0 are equal, prove that a/b = c/d Mathematics CBSE class 10 20172 AnswerIf the sum of first 7 terms of an A.P. is 49 and t hat of its first 17 terms is 289, find the sum of first n terms of the A.P. CBSE Mathematics1 AnswerIf the marginal propensity to consume is greater than marginal propensity to save, the value of the multiplier will be (Choose the correct alternative)- CBSE Economics class 12 20171 AnswerIf, for a positive integer n, the quadratic equation, x(x + 1) + (x + 1) (x + 2) + .....+ (x + n-1 ) (x + n) = 10n has two consecutive integral solutions, then n is equal to :-JEE MAINS-Mathematics-20171 AnswerFor what value of k will k + 9, 2k – 1 and 2k + 7 are the consecutive terms of an A.P? Mathematics CBSE class 10 20161 AnswerIn an A.P., fhe sum of first ten terms is –150 and the sum of its next ten terms is –550. Find the A.P. CBSE Mathematics1 AnswerIn an A.P., the sum of its first ten terms is – 80. and the sum of its next ten terms is – 280. Find the A.P. CBSE Mathematics1 AnswerIn an A.P., the sum of its first ten terms is – 80. and the sum of its next ten terms is – 280. Find the A.P. CBSE Mathematics1 AnswerIf two sides of one triangle are equal to two sides of another triangle and the contained angles are supplementary, show that the two sides are equal in area. CBSE class 9 Mathematics1 AnswerProve that the tangents drawn at the end points of a chord of a circle make equal angles with the chord. Mathematics CBSE class 10 20171 AnswerThe electrical resistivity of few materials is given below in ohm-meter. Which of these materials can be used for making element of a heating device? -CBSE physics class 101 AnswerIf Sn denotes the sum of first n terms of an AP, prove that S30 = 3[S20 - S10]. Mathematics CBSE class 10 20151 AnswerIf Sn, denotes the sum of first n terms of an AP prove that S12 = 3(S8 - S4). Mathematics CBSE class 10 20151 AnswerA solid cube is cut into eight cubes of equal volumes. Find the ratio of the total surface area of the given cube and that of one small cube. Mathematics CBSE class 101 AnswerSay True or False: (a) Each angle of a rectangle is a right angle. (b) The opposite sides of a rectangle are equal in length. (c) The diagonals of a square are perpendicular to one another. (d) All the sides of a rhombus are of equal length (e) All the sides of a parallelogram are of equal length. (f) The opposite sides of a trapezium are parallel-Mathematics-cbse std 6th-Understanding elementary shapes.1 AnswerExplain any three terms of treaty of versailles? - NCERT socialScience-Cbse- Class 6th- 20171 Answer