Question

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

Answer 1

Answer:

a=8

d=-5

a22= a+21d

a22= 8 + 21(-5)

a22= 8 + (-105)

a22= 8-105= -97

a22= -97

Hope it helps

Answer 2

Answer:

-979

Step-by-step explanation:

a=8

d=-5

n=22

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

S22=22/2(2*8+(22-1)-5)

=11(16+(-105))

=11*(-89)

=-979

............

.........