Math, asked by sanaanjum527077, 7 months ago

find the sum of 1st 31 terms of an ap 9,3,-1

Answers

Answered by varshaarya1223

2

Answer:

So n=31

a=9

d=6

S31=(a+(n-1)d)

S31=(9+(31-1)6)

S31=9+180

S31=189

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