How many four digit numbers are there if repetition of digit is allowed

Question

Arun · Answer

There are 9 ways to pick the first digit (1 through 9), there are 10ways to pick the 2nd, 3rd, and 4th digits, so that 9×10×10×10 = 9000

Sandesh Toshniwal · Answer

There are 9 ways to select digit in the first place because zero cannot be placed on the first place.On the 2nd, 3rd and 4th place 10 digits can be filled.Therefore, 9×10×10×10=9000

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How many four digit numbers are there if repetition of digit is allowed

How many four digit numbers are there if repetition of digit is allowed

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How many four digit numbers are there if repetition of digit is allowed

How many four digit numbers are there if repetition of digit is allowed

2 Answers

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