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Consider a -digit number of the form . The number is divisible by:
(a) and only
(b) and only
(c) and only
(d) and

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Important Questions on Playing with Numbers

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How many numbers are there from to which are divisible by both and ?

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HARD

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Consider the following two statements :
I. If is a composite number, then divides
II. There are infinitely many natural numbers such that divides
Then

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Product of four consecutive positive integers is divisible by _____.

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Consider the following statements: For any integer
I.. is never divisible by .
II.. is never divisible by . Then

