How many 2-digit even numbers can be formed from the digits $1, 2, 3, 4, 5$ if **repetition** is allowed?
A$10$
B$15$
C$25$
D$5$
Answer & Solution
Correct answer: A. $10$
Unit's place must be 2 or 4 (2 choices). Ten's place: any of 5 digits. $2 \times 5 = 10$.
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