Question: How do we solve this discrete math question? Let S = {1, 2, 3, 4, 5, 6, 7}. You choose a uniformly random 3-element subset

How do we solve this discrete math question?

How do we solve this discrete math question? Let S = {1,

Let S = {1, 2, 3, 4, 5, 6, 7}. You choose a uniformly random 3-element subset X of S. Thus, each 3-element subset of S has a probability of l/(7 3) of being X. Define the event A = " 4 is an element of X" What is Pr(A)? (a) 7/15 (b) 15/7 (c) 3/7 (d) 7/3

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