Math, asked by syedasaniya37738, 3 months ago

findthe sum of an AP 2.7.12 to 25 terms

Answers

Answered by shirishjha9839

1

Answer:

A.P.=Sn=n/2[2a+(n-1)d]

a=2,d=7-2=5,n=25

S10=25/2[2×2+(25-1)5]

=25/2[4+120]

=25/2×124

=1550

therefore the sum of 25 terms is 1550

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