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If repetition of the digits is allowed, then the number of even natural numbers having three digits is :

Correct Answer: 450

Explanation:

In a 3 digit number one’s place can be filled in 5 different ways with (0,2,4,6,8)


10’s place can be filled in 10 different ways


100’s place can be filled in 9 different ways


There fore total number of ways = 5X10X9 = 450


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