How many five digits number can be formed using digits 1,2,3,4,5,6 without repetition such that numbers are divisible by 8
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Total number of numbers formed by the digits 1, 2, 3, 4, 5 without repetition is 5! =120. Now we know that a number is divisible by 4 if the number placed at its last two digits is divisible by 4. So that last two digits can be 12, 24, 32 or 52, i.e., they can be filled in 4 ways
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