HARD
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IMPORTANT
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The number of times the digit 5 will be written when listing the integers from 1 to 1000, is

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Important Questions on Permutation and Combination

MEDIUM
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IMPORTANT
A person writes letter to six friends and addresses the corresponding envelopes. Let x be the numbers of ways so that at least two of the letters are in wrong envelopes and y be the numbers of ways so that all the letters are in wrong envelopes. Then x-y=
MEDIUM
BITSAT
IMPORTANT
If a parallelogram is cut by two sets of m lines parallel to its sides, then the number of parallelogram thus formed, is
HARD
BITSAT
IMPORTANT
The number of times the digit 5 will be written when listing the integers from 1 to 1000, is