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  1. In x = the value of x is

    2. A.
    10
    B.
    25
    C.
    36
    D.
    44

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    Answer : Option D

    Explanation :

    = (10)2 + (10)3 + ... + (10)8 + (10)9

    = (2)10 + (3)10 + .... + (8)10 + (9)10

    = 2 + 3 + ... + 8 + 9 = 44.

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