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3 February, 09:39

How many three-digit even numbers can be formed using digits from the set {1, 2, 3, 4, 5, 6, 7}

a. if no digit can be repeated in any one number?

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  1. 3 February, 10:10
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    The unit numbers can be 2,4,6. Suppose 2 as the unit number we can form 20 numbers the same way for 4 and 6 so totally 60 numbers.
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