Can you form the number?

Probability Level 1

How many three digit numbers can be formed using the digits 1 , 7 , 8 , 9 with repetition ?????

62 64 63 60

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Gagan Raj by Gagan Raj , 23, India

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2 solutions

Gagan Raj
Mar 1, 2015

To form a three digit number we have to fill up 3 places and this can be done in 4 × 4 × 4 4\times4\times4 ways.

Hence , the answer is 64 64 .

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Excuse me... but I think your question said that digits can be repeated.

Rishabh Tripathi - 6 years, 3 months ago

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Yes the digits can be repeated. That's why the answer is 64 64 . Can i know what your doubt is ????? If any mistake is committed by me please feel free to correct me !!!!!!

Gagan Raj - 6 years, 3 months ago

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Sorry dude.. I think I was myself confused. I kept on lingering to an old method. But then for my own correction, I'll take this ques to one of my friends :)

Rishabh Tripathi - 6 years, 3 months ago
Noel Lo
Jun 3, 2015

4 3 = 64 4^3 = \boxed{64}

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