It is by definition that Probability of an event = (number of favorable cases)/
(exhaustive number of cases)
The number of favorable cases would be 16, 'cause even if 7 of club is picked - although it fulfills the criteria of being a club or being 7, it will be counted as 1 card only.
And therefore the probability is 16/52.
So, whenever dealing with probability questions, try to visualize a real life example...and it will make the problem easy.
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