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How many 4-digit numbers can be formed by using 2, 4, 6, 8, 10, 12 without repetition of digits?

How many 4-digit numbers can be formed by using 2, 4, 6, 8, 10, 12 without repetition of digits? Correct Answer 15

Here making a 4-digit number is equivalent to filling 4 places with 6 numbers. So, the number of ways of filling all the four places is 6C4 = 15. Hence, the total possible 4-digit numbers from the above 6 numbers are 15.

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