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

Answer and explanation

Correct answer: 420 numbers

If the units digit is 0, the other places can be filled in 6 × 5 × 4 = 120 ways. If the units digit is 2, 4, or 6, there are 3 choices for it, 5 choices for the nonzero thousands digit, then 5 and 4 choices for the remaining places: 3 × 5 × 5 × 4 = 300. The total is 120 + 300 = 420.

Related tags

Counting PrincipleNumber FormationFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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