NIFT UG 2018 Question Paper with solutions

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Question : 4 of 150

Marks: +1, -0

The number

(6 x^{2}+6 x)

for natural number

x

is always divisible by

6 and 12
Only 12
Only 6
Only 3

Solution:

6 x^{2}+6 x=6 x(x+1)

which is clearly divisible by 6 and 12 as

x(x+1)

is even.

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