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Using the digits 1, 2, 3, 4, 5, 6, 7, and 8 without repetition, form 2-digit numbers greater than 60. How many numbers are possible?

Answer and explanation

Correct answer: 21 numbers

The tens digit must be 6, 7, or 8. For each choice, the units digit has 7 remaining choices; when the tens digit is 6, all these choices make the number greater than 60. Thus, 3 × 7 = 21 numbers are possible.

Related tags

Counting PrincipleDigit ArrangementsClass 11Fundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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