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4 October, 11:23

Find the missing specified terms in the following sequence

Arithmetic: a1, a2, 7, a4, ..., a7, 82, ...

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  1. 4 October, 14:33
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    Third term a3 = 7 and 8th term a8 = 82

    8th term - third term = 5d where d is the common difference:-

    5d = 82-7 = 75

    d = 15

    so a2 = 7-15 = - 8

    and a1 = - 8 - 15 = - 23

    a4 = 7 + 15 = 22

    a5 = 37

    a6 = 52

    a7 = 67
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