Question

find the number of terms in the given AP

Answer 1

a=18

d=-5/2

an=-47

an=18+(n-1)*-5/2=-47

(n-1)*-5/2=-47-18

(n-1)*-5/2=-65

(n-1)=-65*-2/5

(n-1)=-13*-2

(n-1)=26

n=26+1=27

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Answer 2

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