help please i dont understand.....

Question

Suppose that you and a friend are playing cards and you decide to make a friendly wager. The bet is that you will draw two cards without replacement from a standard deck. If both cards are clubs, your friend will pay you $359. Otherwise, you have to pay your friend $21

Step 1 of 2 :  

What is the expected value of your bet? Round your answer to two decimal places. Losses must be expressed as negative values

Answer 1

Pr(2 clubs)=13/52x12/51= 1/4 x 4/17= 1/17

Pr(not 2 clubs)=1-1/17= 16/17

Expected value = 359(1/17)-21(16/17= 359/17- 336/17= 23/17

= $1.35 average profit each time you play

play it about 265 times you'll make about 265x1.35= $359

you'll win 1 out of 17 times, and lose 16 out of 17 times