Math, asked by faizakhan1607, 1 year ago

find the sum of first 22nd term of an Ap in which d=7 and 22nd term is 149

Answers

Answered by brainlybestuser

what is the full form of AP

brainlybestuser: 149=a+147

brainlybestuser: so,a=2

brainlybestuser: now,

shivanshummishra: soory i went wrong

brainlybestuser: sum if 22 terms will be

brainlybestuser: sn=n/2(2a+(n-1)d)

brainlybestuser: s22=22/2(2×2+147)

brainlybestuser: s22=11×151

brainlybestuser: s22=1661

shivanshummishra: ok thank u

Answered by Mitali1784

a22 =a+(22-1)7
149=a+147
so, a=2
now sum if 22 terms will be,
Sn =n/2 (2a+(n-1)d)
S22=22/2(2×2+(22-1)7)
S22=11×(4+147)
S22=1661

faizakhan1607: thank you yaar for helping me..

brainlybestuser: ok

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