Reasoning Class 5 Possible Combinations

Asked by AKSHAY GURU VARADHARAJAN · SRI CHAITANYA TECHNO SCHOOL, JAYANTI NAGAR.

Rohan wants to create a 3-digit security code using the digits 0, 5, and 8. How many different codes can he form if he is allowed to repeat the digits?

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A 9
B 18
C 27
D 24

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Answer: C. 27

Simple Explanation: For each of the 3 spots in the code, Rohan has 3 choices (0, 5, or 8). So, the total combinations are 3 × 3 × 3 = 27. (Note: In codes, 0 can be at the start!)

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Rohan wants to create a 3-digit security code using the digits 0, 5, and 8. How many different codes can he form if he is allowed to repeat the digits?

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