What is the probability that the the 4 digit's no. which is formed by using the digits 1,2,3,4,5,6 is divisible by 4 ?
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Since 100 is divisible by 4, any number is divisible by 4 if the last 2 digits form a 2 digit number divisible by 4. So what combinations of your digits form a 2 digit number divisible by 4? (I.e., 16 is good, 14 is bad).
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