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Mathematics 7 Online
OpenStudy (anonymous):

Pat picked a card from a standard deck. What is the probability that Pat picked a diamond or a jack?

jimthompson5910 (jim_thompson5910):

how many diamonds or jacks are there?

OpenStudy (anonymous):

I think there are 13 diamonds and 4 jacks

jimthompson5910 (jim_thompson5910):

that much is true

jimthompson5910 (jim_thompson5910):

however, there is a jack of diamonds, so when you say "there are 17 cards that are either jacks or diamonds" you are double counting one card

OpenStudy (anonymous):

ok

jimthompson5910 (jim_thompson5910):

so there are really 16 cards that are either jacks or diamonds

jimthompson5910 (jim_thompson5910):

making the probability to be 16/52 = 4/13

OpenStudy (anonymous):

thank you I understand now

jimthompson5910 (jim_thompson5910):

you're welcome

OpenStudy (anonymous):

I got this correct!! Ty!!

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