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## Answers

Here, The AP is 1, 2, 3,.......80

Here, a=1, an= 80, d=2-1=1

an=a+(n-1)d

⇒ 80=1+(n-1)1

⇒ 80-1 = n-1

⇒ 79=n-1

⇒ 79+1 = n

⇒ 80=n

therefore there are 80 terms.

Thank You......!!!!!!!!!

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Yours, Jahnavi.