Question
Which of the following numbers will completely divide (`49^15` - 1) ?
Answer: Option A
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(`x^n` - 1) will be divisible by (`x` + 1) only when n is even .
(`49^15` - 1) = {`(7^2)^15` - 1} = (`7^30` - 1) , which is divisible by ( 7 + 1), i.e.,8
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