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Numbers - General Aptitude

Q1:

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

A 3

B 2

C 1

D 0

ANS:B - 2

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