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Question
The number of different four-digit numbers that can be formed with the digits 2, 3, 4, 7 and using each digit only once is ______.
Options
120
96
24
100
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Solution
The number of different four-digit numbers that can be formed with the digits 2, 3, 4, 7 and using each digit only once is 24.
Explanation:
Four-digit numbers are to be formed from the digits 2, 3, 4, 7 without repetition
So, the required 4-digit numbers = 4P4
= 4!
= 4 × 3 × 2 × 1
= 24
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