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

Posted by Yashoda Hp 5 years, 6 months ago

CBSE > Class 10 > Mathematics

2 answers

Shubham Saxena ???? 5 years, 6 months ago

A = 8 ,, d = 3 - 8 = - 5 ,, S22 = 22 / 2 [ 2 ( 8 ) + ( 22 - 1 ) - 5 ,, S22 = 11 [ 16 + 21 × - 5 ] ,, S22 = 11 [ 16 + ( - 105 ) ] ,,,, S22 = 11 [ - 121 ] ,, S22 = - 1331 . = - 1331 . Thank you.

2Thank You

Yogita Ingle 5 years, 6 months ago

a=8

d=3−8=−5

S₂₂=n/2[2a+(n−1)d]

S₂₂=22/2[2a+21d]

S₂₂=11[2(8)+21(−5)]

S₂₂=11(−89)

=−979.

1Thank You

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