Question

1.find the sum of first 25th term of an a.p. whose nth term is given by Tn=2-3n

2. if m times the mth term of an a.p. is equal to n times its nth term; find (m+n)th term.

3.if the sum of first n, 2nand 3n terms of an a.p. be s1,s2 and Sa respectively then prove that Sa= 3(s2-s1)

Answer 1

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