Question
How many even five-digit numbers can be formed using the digits 0 to 9 if no digit is repeated?
Total number=9×8×7×6×5=15120 This also includes the number with 0 in the first position, thus we also have a 4-digit number. 
Thus, the total number of 4-digit numbers=8×7×6××4=1344 Total number=15120-1344=13776.More Permutation and combination Questions
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