Question

five terms, then prove that the 20 term of the arithmetic progression is --112
Suis 2 and sum of its first five terms is one touhotrex
53. If in an A.P. the sum of m terms is equal to the sum of n terms. Prove that the sum of
(m + n) term is zero.
54. If the sum of p, q and r terms of an arithmetic progression is a, b and crespectively, prove that
(q-1)++
INCERT Exemplar
P
55. If ratio of sum of n terms of two AP is 14 - 4n: 3n+ 5. Find the ratio of their 8 terms.
1
56. If p term of an AP is
1
term is
Prove that sum of first pą terms is (2 + 1).
a
. 57.4f the sum of first p terms of an AP is q and sum of first q terms is p. Find the sum of the
(1) (+) terms
(11) p-q) terms
58. If the sum of n, 2n and 3n terms of an arithmetic progression is SS2 and Sz. Prove that
S3 = 345₂-5
and a
P
59. If the roots of the equation (b-c)x2 +(c - a) x + (a - b) = 0 are equal. Prove that a, b, care
arithmetic progression.
60. If Sn = n'p and Sn = m p. mn. Prove that s, - pº
61) if. S. and S, are the sum of n terms of three arithmetic progression whose first term is
common difference are 1, 2 and 3 respectively, prove that S + S3 = 282-
0,-
d.
ber-p)+(p-q)=0 Leave​

Answer 1

Answer:

First keep the question properly