Question 42

Using digits 5, 3, 2, 1 without repetition, how many four digit odd numbers can be made?

Name: Using digits 5, 3, 2, 1 without repetition, how many four digit odd numbers can be made?
Uploaded: March 31, 2023, 11:05 a.m.
Duration: 1 min 2 s
Description: Using digits 5, 3, 2, 1 without repetition, how many four digit odd numbers can be made?

Solution

To form an odd number, units digit can be filled by either 1,3,5 in 3 ways.

The remaining places can be filled in 3! ways

Total number of odd numbers that can be made = 3! x 3 = 6 x 3 = 18

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TISSNET 2014

Using digits 5, 3, 2, 1 without repetition, how many four digit odd numbers can be made?

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