The number of 3-digit numbers that can be formed by combining the three first digit numbers, is: A.27 B.18 C.9 D.8

Assuming digits may be repeated and you are talking about 1,2, and 3 as choices

numer of formings = 3*3*3 = 27

Did you know?

Did you know that the number of 3-digit numbers that can be formed by combining the three first-digit numbers is only 9? This may seem counterintuitive, but when selecting a number for each of the three digits, you must take into account that the first digit cannot be zero. Therefore, the options for the first digit are 1, 2, and 3. For the second and third digits, you can choose any of the three numbers - 1, 2, or 3. Multiplying the number of options for each digit (3 x 3 x 3) gives us a total of 27 possible combinations. However, since the first digit cannot be zero, we subtract the 1 combination where all three digits are 0. So, the actual number of 3-digit numbers that can be formed is 27 - 1 = 26. Therefore, the correct answer is C.9.