Question

for an ap -7,-4,-1,2,5........17​

Answer 1

Answer:

a=-7

d=-4-(-7)=-4+7=3

an=17

an=a+(n-1)d

17=-7+(n-1)3

17+7=(n-1)3

24=(n-1)3

(n-1)=24/3

(n-1)=8

n=8+1=9

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