Question
56−1 is divisible by : (CAT 1995)
Answer: Option B
:
B
Ans: (b)
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:
B
Ans: (b)
(56−1)=(53)2−(1)2=(125)2−(1)2=(125+1)(125−1)=126∗124=31∗4∗126. It is therefore clear that the expression is divisible by 31.
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