Question
Let N=553+173−723. N is divisible by : (CAT 2000)
Answer: Option D
:
D
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:
D
Ans: (d).
N=553+173−723=(54+1)3+(18−1)3−723
=(51+4)3+173−(68+4)3.
These two different forms of the expression are divisible by 3 and 17 both.
Elimination strategy:
Check the divisibility by 13, it is seen that it is not divisible, now check for 3, it is
divisible, hence the only option will be (d)
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