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How many 3-digit numbers above 600 can b...

How many 3-digit numbers above 600 can be formed by using the digits 2, 3, 4, 5, 6, if repetition of digits is allowed?

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The correct Answer is:
25
Given digits are 2, 3, 4, 5, 6 and repetition of digits is allowed.
The hundred's place can be filled by 6 in 1 way only.
Each of the ten's and unit's digits can be filled by any of the given five digits in 5 ways.
Required number of numbers `=(1xx5xx5)=25.`
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