[計量] How many five digit numbers
How many five digit numbers can be formed using the
digits 0, 2, 3, 4 and 5, when repetition is allowed such
that the number formed is divisible by 2 or5 or both?
答:1500
Four persons enter the lift of a seven storey building at
the ground floor. In how many ways can they get out of
the lift on any floor other than the ground floor?
答:1296
A box contains 5 red and 4 blue balls. In how many
ways can 4 balls be chosen such that there are at most
3 balls of each colour?
答:120
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