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Q.
If x is a whole number, then x²(x² - 1) is always divisible by ?
A.
4
B.
8
C.
12
D.
None
View Answer
Correct choice: C
Explanation:
we can do this by trial and error method. Putting x = 2,we get 2²(2² - 1) = 12. checking with other integers, the above equation always gives a value which is a multiple of 12, So, x²(x² - 1) is always divisible by 12.
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