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1 October, 21:08

The first term of an AP is 5, common difference is 3 and the last term is 80. Find the number of terms.

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  1. 1 October, 23:48
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    n=26

    Step-by-step explanation:

    an=a + (n-1) d

    80=5 + (n-1) 3

    80=5+3n-3

    80-2=3n

    78/3=n

    n=26
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