Q:
If repetition of the digits is allowed, then the number of even natural numbers having three digits is :
Answer & Explanation
Answer: B) 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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