Question

Find the sum of following Arithmetic progression.

1) 1+4+7+10.find sum upto 10 terms.​

Answer 1

Answer:

Sn=n/2(2a+(n-1)d)

S10=10/2(2a+(10-1)d

S10=5(2+9×3)

S10=5(2+27)

S10=5×29

S10=145

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