If the 8th term of an AP is 36 and the 16th term is 68.
a) the first term
b) the common difference
c) The 20th term

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  1. (b) clearly d=4, since
    T16-T8 = 8d = 32

    Now do (a) and (c)
    For (c), note that T20-T16 = 4d

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