Question

how many terms of the A.P.1 8,16,14....,be taken so that their sum is zero

Answer 1

Answer:

As per question,

Sn = 0

n/2(2a + (n - 1)d) = 0

Here, first term is 18 and common difference = (-2)

So we have...

n/2(18×2 + (n - 1)(-2)) = 0

n - 1 = 18

n = 19

So, we should take 19 terms of the AP

Answer 2

Answer:

Step-by-step explanation: