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How many 3-digit even numbers can be formed using the digits 0, 1, 2, 3, 4, 5, 6, and 7 without repetition?

Answer and explanation

Correct answer: 150 numbers

Count two cases. If the units digit is 0, the hundreds and tens places have 7 and 6 choices, giving 7 × 6 = 42 numbers. If the units digit is 2, 4, or 6, there are 3 choices for it; the hundreds place then has 6 nonzero choices and the tens place has 6 choices, giving 3 × 6 × 6 = 108. The total is 42 + 108 = 150 numbers.

Related tags

Counting PrinciplePermutationsClass 11Fundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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