Questions
The number of 9 digit numbers which have all distinct digits, is
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a
10!
b
9!
c
8(9)!
d
10! -9!
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Correct option is D
The required number of ways= The number of ways of permuting nine digits out of ten digits 0, 1, 2, …, 9– The number of ways of permuting nine digits out of nine digits 1, 2, …, 9=10P9−9P9=10!1!−9!=10!−9!Similar Questions
The number of ways in which we can get at least 6 successive tails when a coin is tossed 10 times in a row, is
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