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Chapter 6 Class 11 Permutations and Combinations
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Example 3 How many 2 digit even numbers can be formed from the digits 1, 2, 3, 4, 5 if the digits can be repeated? Let the 2 digit even number be Only 2 numbers are possible at units place (2 and 4) as we need even number. But at tens place all 5 are possible Number of 2 digit even numbers = 2 5 = 10

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