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You want to derive the formula for the nth term of an A.P?

kk..

yes..

yes..and thank u

one question..why do we add 1 on last step

because thee are n terms and before we have n-1 terms

it goes on decreasing such as n, n-1, n-2...

I don't get you, where do you have doubt?

an=a1+(n−1)d, y there is 1

you mean the 1 in n-1?

yes.

kkk

Do you understand?

yes