Arithmetic Ability
Permutations and Combinations

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Q.

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

View Answer

Correct choice: B

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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