How many terms of the sequence should be taken so that their sum is zero? A sequence of numbers is displayed as 18, 16, 14, and so on.

Sn = [2a + (n – 1) d]0 = [2(18) + (n – 1) (-2)]38n – 2n2 = 0n = 0 (which is not possible)n = 19Therefore, n = 19 terms

Q5 of 202 Page 9

How many terms of the sequence should be taken so that their sum is zero?

S_n = [2a + (n – 1) d]

0 = [2(18) + (n – 1) (-2)]

38n – 2n² = 0

n = 0 (which is not possible)

n = 19

Therefore, n = 19 terms

Find the sum of n terms of an A.P. whose n^th term is given by

If the n sum of a certain number of terms starting from first term of an A.P. is is 116. Find the last term.

How many terms are there in the A.P. whose first and fifth terms are 14 and 2 respectively and the sum of the terms is 40?

How many terms of the A.P.must be taken so that their sum is 636?