HARD
BITSAT
IMPORTANT
Earn 100

The number of times the digit will be written when listing the integers from to , is
(a)
(b)
(c)
(d)None of these

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Important Questions on Permutation and Combination
MEDIUM
BITSAT
IMPORTANT
A person writes letter to six friends and addresses the corresponding envelopes. Let be the numbers of ways so that at least two of the letters are in wrong envelopes and be the numbers of ways so that all the letters are in wrong envelopes. Then

MEDIUM
BITSAT
IMPORTANT
If a parallelogram is cut by two sets of lines parallel to its sides, then the number of parallelogram thus formed, is

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