How many numbers of 3-digits can be formed with the digits 1, 2, 3, 4, – InterviewSolution

1.

How many numbers of 3-digits can be formed with the digits 1, 2, 3, 4, 5 when digits may be repeated?

Answer»

Since repetition is allowed, each of the 3 places in a 3-digit number can be filled in 5 ways.

H	T	O
5 ways	5 ways	5 ways

∴ Required number of 3-digit numbers = 5 × 5 × 5 = 5³ = 125

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