Question

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

Answer 1

Answer:

a=8

d=3−8=−5

S

22

=

2

n

[2a+(n−1)d]

S

22

=

2

22

[2a+21d]

S

22

=11[2(8)+21(−5)]

S

22

=11(−89)

=−979.

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