Question

Sum of the 1st Term of an A.P.
Explain The Formula .​

Answer 1

Answer:

S=n/2(2a+(n-1)×d)

Step-by-step explanation:

S=sum of n terms

n=number of terms

a=first term

d=common difference

Hope it will help you

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Answer 2

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

hope u get ur answer