Reasoning Class 5 Possible Combinations

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

How many 2-digit numbers can be formed using the digits 2, 5, 7 and 9 if digits may be repeated?

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A 16
B 12
C 14
D 10

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Answer: A. 16

A. 16
For the first digit, you have 4 choices (2, 5, 7, or 9).
For the second digit, you also have 4 choices (repetition is allowed).
Calculation: 4 × 4 = 16 possible combinations.

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How many 2-digit numbers can be formed using the digits 2, 5, 7 and 9 if digits may be repeated?

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