Question: 1. Let n be a positive integer. Suppose that we choose 4 numbers a, b, c, d uniformly at random (without replacement) from 1,2,3,..,40n. Find

1. Let n be a positive integer. Suppose that we choose 4 numbers a, b, c, d uniformly at random (without replacement) from 1,2,3,..,40n. Find the probability that a+b+c+d is divisible by 4

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