Question

the first and the last term of arithmetic progression are 32 and -43. If the sum of the series is-88, then it has how many terms.​

Answer 1

Given

$a = 32 \\ l = -43$

$Sn = -88$

To find

no. of terms = n

Solution

$Sn = \frac{n}{2} (a + l)$

$- 88 = \frac{n}{2} (32 - 43)$

$- 176 = n( - 11)$

$\frac{ - 176}{ - 11} = n$

$\boxed {n \: = 16}$

Answer 2

Answer:

n = 16 is the soln

Explanation:

Hope this helps ✌️