Math, asked by digalsneha49, 8 months ago

find the sum of 1st 22terms of the ap 8 , 3 ,-2 ..........is _ ?

Answers

Answered by AngelineSudhagar
0

Answer:

s22= -979

Step-by-step explanation:

Given:

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

We know that,

sn =  \frac{n}{2} (2a + (n - 1)d)

s22 =  \frac{22}{2} (2(8) + 21( - 5))

 = 11(16 - 105)

= 11(-89) = -979

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