If x > 0 and y > 0, where is the point (x, y) located? on a coordinate plane

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.

Can someone check if i did this correct. it’s number 4 if you’re wondering.

Use sigma notation to represent the following series for 9 terms.