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In an AP, the thirteenth term is 27, and the seventh term is three times the second term. Find the first term,?

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    a+12d = 27 , (#1)

    a+6d = 3(a+d)
    a+6d = 3a + 3d
    3d = 2a
    then 12d = 8a

    in a+12d = 27
    a + 8a = 27
    9a = 27
    a = 3

    first term is 3

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