bodisontbernard
20.09.2021 •
Mathematics
Please help
Considered numbers (strings) of length 8 over the 10 digits 0, 1, 2...,9 . Suppose that the repetition of the digits is allowed and that the numbers may begin with 0.
(a) how many different numbers are there?
(b) how many of these numbers contain at least two 2s?
(c) what is the probability that a string of length 8 will contain at least two 2s?
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