find the probability that the five digit number using 1,2,5,6 and 8 would be divisible by 4

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  1. To be divisible by 4, the last two digits must be a multiple of 4. Using those digits, the only possibilities are


    There are 5^5 possible 5-digit numbers. Of those,

    5^3 * 5 = 5^4 end in those digits.

    So, 5^4/5^5 = 1/5 of the numbers will be divisible by 4.

    Adjust that if no repetitions are allowed.

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