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Mathematics 17 Online
OpenStudy (anonymous):

What is the probability of randomly drawing a 10 or a ♦ from a deck of cards?

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?

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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