n is a whole number which when divided by 4 gives 3 as remainder. What will be the remainder when 2*n is divided by 4 ?

Let n=4*q + 3. Then, 2*n = 8*q + 6 = 4(2*q + 1) + 2. Thus when 2*n is divided by 4, the reminder is 2.

Four number-pairs have been given, out of which three are alike in some mannerandoneis different. Select the number-pair that is different.

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