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The digits 5, 7, 1, and 9 are to be used in a roll number in a school. How many different roll numbers are possible if repetitions are not permitted?
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16 votes
The digits 5, 7, 1, and 9 are to be used in a roll number in a school. How

many different roll numbers are possible if repetitions are not permitted?

User OkieOth
by
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1 Answer

12 votes

Answer:

1, 7, 5, 9
7, 1, 9, 5

9, 5, 1, 7

But there are about 10 possible combinations.

Explanation:

User Nilesh Rathore
by
8.5k points
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