Question: Please provide a well explained, correct solution for the following How many 4-digit numbers can he formed if [a] repetitions are allowed (b) repetitions are

Please provide a well explained, correct solution for the following
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How many 4-digit numbers can he formed if [a] repetitions are allowed (b) repetitions are not allowed (0) the last digit must be zero and repetitions are not allowed. In how many ways can a committee of 5 people be chosen out of 9 people
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