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A 3-digit number has its hundreds digit chosen from 1, 2, or 3, and its units digit chosen from 5, 7, or 9. Its tens digit can be any digit from 0 to 9. How many such numbers are possible?

Answer and explanation

Correct answer: 90 numbers

There are 3 choices for the hundreds digit, 10 for the tens digit, and 3 for the units digit. By the multiplication principle, the total is 3 × 10 × 3 = 90 numbers.

Related tags

Fundamental Principle Of CountingClass 11 MathematicsPermutations And CombinationsMathematicsClass 11 Mcq

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