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Nmber of natural numbers between 100 and...

Nmber of natural numbers between 100 and 1000 such that at least one of the digits is 7,is

A

225

B

243

C

252

D

none

Text Solution

Verified by Experts

The correct Answer is:
C
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MOTION-THEORY AND EXERCISE BOOK-EXERCISE - 4 (LEVEL -II)
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  4. Using permutation or otherwise, prove that (n^2)!/(n!)^n is an integer...

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