How do we solve this discrete math question Let S 1 2 3 4 5

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 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

Pr(A) is option: (c) 3/7

$How do we solve this discrete math question? Let S = {1, 2, 3, 4, 5, 6, 7}. You choose a uniformly random 3-element subset X of S. Thus, each 3-element subset o$

How do we solve this discrete math question Let S 1 2 3 4 5

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