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9 June, 11:17

Find the 6th term of a geometric sequence t3=444 t7=7104

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  1. 9 June, 11:44
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    Third term = t3 = ar^2 = 444 eq. (1)

    Seventh term = t7 = ar^6 = 7104 eq. (2)

    By solving (1) and (2) we get,

    ar^2 = 444

    => a = 444 / r^2 eq. (3)

    And ar^6 = 7104

    (444/r^2) r^6 = 7104

    444 r^4 = 7104

    r^4 = 7104/444

    = 16

    r2 = 4

    r = 2

    Substitute r value in (3)

    a = 444 / r^2

    = 444 / 2^2

    = 444 / 4

    = 111

    Therefore a = 111 and r = 2

    Therefore t6 = ar^5

    = 111 (2) ^5

    = 111 (32)

    = 3552.

    Therefore the 6th term in the geometric series is 3552.
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