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math

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if 4,2x-4,......,64,21x+2 are the terms of GP . find the value of x ?

  • math -

    if GP , then
    (2x-4)/4 = (21x+2)/64
    128x-256 = 84x + 8
    44x = 264
    x = 6

    check:
    4, 8, ... , 64, 128

    YUP, common ratio of 2

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