Question
Which of the following numbers will completely divide (4915 - 1) ?
Which of the following numbers will completely divide (4915 - 1) ?
Answer: Option C
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`(x^n - a^n)text{ is completely divisible by }(x + a) text{ when n is even}`
`(49^{15} - 1) = [(7^{2})^{15} - 1] = (7^{30} - 1) = (7^{30} - 1^{30})
text{which is completely divisible by }(7 + 1) = 8`
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