Question

an=200,d=10,a=20find n
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Answer 1

to find the total number of terms in the AP we use the following formula

an=a+(n-1)d

on putting the given values, we get.

200=20+(n-1)10

200-20=(n-1)10

180=(n-1)10

180/10=(n-1)

18=n-1

n=18+1

n=19

Answer 2

given:-

Answer:

an=200,d=10,a=20

an=a+(n-1)d

200=20+(n-1)10

200=20+10n-10

200=10+10n

10n=200/10

n=20/10

n=10

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