Math, asked by yogeshsharma90637, 1 year ago

add/sum of this a.p.=.7+.71+.72+........to n terms

Answers

Answered by kamalchem1980

1

Answer:

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

Step-by-step explanation:

s=n/2(140+(n-1))

s=70n+(n^2)/2-n/2

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