Question: How many two-digit numbers can be formed using the digits from {2, 4, 6} if the following is true. (See Example 7.) (a) Repetitions are

How many two-digit numbers can be formed using the digits from {2, 4, 6} if the following is true. (See Example 7.)

(a) Repetitions are not allowed? two-digit numbers (b) Repetitions are allowed? two-digit numbers

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