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25 November, 07:26

4. Which term of the AP:3, 8, 13, 18, ..., is 78?

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  1. 25 November, 11:02
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    Step-by-step explanation:

    The first term of the AP (a) = 3

    and common difference (d) = 8-3 = 5

    therefore, a + (n-1) d = 78

    => 3 + (n-1) 5 = 78

    => n-1=75/5

    => n-1 = 15

    => n = 16

    16th term of the AP is 78
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