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OpenStudy (anonymous):
ten people are entered in a race. If there are no ties, how many can the first two places come out? a. 180 b. 90 c. 58 d. 5
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OpenStudy (lucaz):
for the 1st place we have ten options, with one person in first place we have 9 options for the second place. 10*9
OpenStudy (anonymous):
so it would be b 90?
OpenStudy (lucaz):
yes
OpenStudy (lucaz):
you can also use the permutation formula
OpenStudy (anonymous):
oh ok, thank you!
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OpenStudy (lucaz):
no problem
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