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A 4-digit number is formed with digits from 1 to 5 in its first two places and digits from 6 to 9 in its last two places. Repetition is allowed. How many such numbers are possible?

Answer and explanation

Correct answer: 400 numbers

Each of the first two places has 5 choices, and each of the last two has 4 choices. Since repetition is allowed, these choices remain available at every place. Thus, the total is 5 × 5 × 4 × 4 = 400 numbers.

Related tags

Fundamental Principle Of CountingClass 11 MathematicsPermutations And CombinationsMathematicsClass 11 Mcq

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