4) How many two-digit numbers can be formed from the digits 2, 4, 6, 8, 9 if: a) no digit is repeated in any number? b) repetitions are allowed?
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To choose the first digit, we have 5 options (2, 4, 6, 8, or 9). After choosing the first digit, we have 4 options left for the second digit. Show more…
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