If the sum of the first 22 terms of AP 9,4,-1....
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Answer:
Given that,
a=9,
d=-5
the sum of first 22 terms of AP
Sn=n/2[2a+(n-1)d]
S22=22/2[2(9)+(22-1)(-5)]
=11[18+21(-5)]
=11[18×-105]
=11×-1890
=-20790
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