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Two digit even numbers formed from the digits 1, 2, 3, 4, 5 with repetition allowed number:
A10
B15
C20
D25
Answer & Solution
Correct answer: A. 10
1. The units place must be 2 or 4, so 2 ways.
2. The tens place has all 5 digits.
3. That gives 10 numbers.
_Source: NCERT Class 11 Mathematics, Chapter 7, Permutations and Combinations._
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