Need quick help with this thank you

Which equation represents the partial sum of the geometric series?

Astandard deck of cards contains 52 cards. one card is selected from the deck. (a) compute the probability of randomly selecting a seven or king. (b) compute the probability of randomly selecting a seven or king or jack. (c) compute the probability of randomly selecting a queen or spade.

Fredrick designed an experiment in which he spun a spinner 20 times and recorded the results of each spin