Question

Find the sum terms of the AP in 5,2,-1,-4,-7​

Answer 1

Answer:

a=First term =5

d=common difference=-3

n=no.of terms=5

l=last term=-7

Sn= Sum of terms =

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

$= \frac{5}{2} (5 + ( - 7))$

$\frac{5}{2} \times - 2 = - 5$

Therefore sum of the terms of A.P is -5.