Correct Answer - Option 2 : 24
Given:
Number are formed by using 6, 1, 2, 3
Calculation:
Number of ways to fill the first position = 4
Number of ways to fill second position = 3
Number of ways to fill third position = 2
Total number of ways = 4 × 3 × 2
⇒ Total number of ways = 24
∴ The total number of 3 digit number is 24.
If the repetition of number was allowed then we can take each digit in 4 different ways and so, the answer will be 4 × 4 × 4 = 64