How many 3-digit numbers can be formed using the digits 1, 2, 3, 4, 5, 6 such that the number is even and digits **can** be repeated?
A$36$
B$72$
C$216$
D$108$
Answer & Solution
Correct answer: D. $108$
Units place must be even: 2, 4, or 6 (3 choices). Tens and hundreds: 6 choices each (repetition allowed). $6 \times 6 \times 3 = 108$.
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