Question

Find the sum of the first 22 terms of the AP : 8, 3, -2, . . .

Answer 1

Answer:

-979

Step-by-step explanation:

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

n=22, a=8, d= -5

Sn= 22/2 (2 (8)+(22-1)(-5))

Sn=11 (16+21 (-5))

Sn=11 (16-105)

Sn= 11 (-89)

Sn= -979