Mathematics · Permutations and Combinations
How many 4-digit numbers can be generated from the digits 1, 2, 3, 4, 5, and 6 such that the digits 1, 2, and 3 always appear together as a string '123'? No digit appears more than once in a number.
- 18
- 24
- 36✓
- 412
Correct answer
6
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