Question 42
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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