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Question

Total number of 4 digit numbers that can be formed using the digits 1,2,5,6,7 and that are divisible by 4 is


Solution

For all possible 4 digit number repetition is allowed
Last two digit can be filled in 6 ways [i.e 12,16,52,56,72,76,] remaining 2 places can be filled with 5 digits in 5×5=25 ways.
Number of numbers divisible by 4=6×25=150

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