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Question

How many 2 digit even numbers can be formed from the digits 1,2,3,4,5 if the digits can be repeated?

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Solution

Step 1:
Finding different number of ways.
For 2 digits even number, only 2 digits are possible at unit place 2 or 4 and at tens place all 5 digits are possible.

Step 2:
Using multiplication principle.
Total number of 2 digit even number =2×5=10
Hence, Number of 2 digit even numbers =10

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