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  1. (49)15 – 1 is exactly divisible by :
    1. 50
    2. 51
    3. 29
    4. 8
Correct Option: D

As we know that ,
xn – an is exactly divisible by (x – a) if n is odd.
∴ (49)15 – (1 )15 is exactly divisible by 49 – 1 = 48, that is a multiple of 8.
Hence required answer is 8.


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