Q.
There exists a natural number N which is 50 times its own logarithm to the base 10, then N is divisible by
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a
5
b
7
c
9
d
11
answer is A.
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Detailed Solution
N=50 log10N⇒ log10N=N50⇒ N=(10)N/50⇒ N1/N=(10)1/50=(10)2/100=(100)1/100∴ N=100
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