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Mathematics, 29.09.2019 02:30 samsmith666

(a) how many positive integers are there between 1000 and 4999, inclusive?

(b) how many positive integers between 1000 and 4999, inclusive:

1. have no repeated digit?

2. have at least one repeated digit?

3. have at most two repeated digits?

note that by `one repeated digit' we mean that there is a digit that appears

at least twice (eg, 1123 has one repeated digit). similarly, by `two repeated digits'

we mean a digit that appears at least three times (eg, 1112).

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(a) how many positive integers are there between 1000 and 4999, inclusive?

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