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OpenStudy (anonymous):
What is the probability of randomly drawing a 10 or a ♦ from a deck of cards?
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jimthompson5910 (jim_thompson5910):
How many 10s are there?
OpenStudy (anonymous):
4
jimthompson5910 (jim_thompson5910):
how many diamond cards are there
OpenStudy (anonymous):
1
jimthompson5910 (jim_thompson5910):
1 diamond card only?
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OpenStudy (anonymous):
13
jimthompson5910 (jim_thompson5910):
so there are 4+13-1 = 16 cards that are either a 10 or a diamond card we subtract 1 because we counted the 10 of diamonds twice when we say 4+13
jimthompson5910 (jim_thompson5910):
divide that by 52 to get the probability
OpenStudy (anonymous):
cool thanks Jim
jimthompson5910 (jim_thompson5910):
np
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