find the sum of first 22 terms of an AP in which d=7 and 22 nd term is 149
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Answered by
11
Answer:1661
Step-by-step explanation:
a+21d=x22
a+(21×7)=149
a+147=149
a=149-147
=2
s22=n/2(a+x22)
=22/2(2+149)
=11×151
=1661
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2
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