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A 3-digit number must be greater than 200 and less than 700. Its digits are chosen from 1, 2, 3, 4, 5, 6, 7, and 8 without repetition. How many such numbers are possible?

Answer and explanation

Correct answer: 210 numbers

The hundreds digit must be 2, 3, 4, 5, or 6, giving 5 choices. Each choice makes the number greater than 200 and less than 700. With no repetition, there are then 7 choices for the tens digit and 6 for the units digit. The total is 5 × 7 × 6 = 210.

Related tags

Counting PrincipleNumber FormationFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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