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How many two digit even numbers can be formed from the digits 1, 2, 3, 4 and 5 if the digits may be repeated?
ATen numbers
BFive numbers
CSix numbers
DTwo numbers
Answer & Solution
Correct answer: A. Ten numbers
1. The units place must be even, so only 2 and 4 may sit there.
2. The tens place is unrestricted and takes any of the 5 digits.
3. The total is 2 times 5, which is 10.
_Source: NCERT Class 11 Mathematics, Ch 6 'Permutations and Combinations'_
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