- #1
nhrock3
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in a three floor building on each store we have 3 appartments.
so in total we have 9 appartments.
every appartment has one person.
3 people enter the elevator(from the entrace of th building),each one goes to the floor he lives in.
A)
what are the odds that the elevator will stop at each floor
B)
what are the odds that the elevator will stop at two floors
C)
what are the odds that in the elavator would be 2 tenants from the second floor
regarding A:
we have 3 places to put 3 people so
for the first from we have 3 options the secong one 2 options and on the last floor we have only one person.
so its
[tex]\frac{3*2*1}{(_{3}^{9})}[/tex]
correct?
and i don't know why all the oprions(the expresion in the denominator) is
9 over 3
so in total we have 9 appartments.
every appartment has one person.
3 people enter the elevator(from the entrace of th building),each one goes to the floor he lives in.
A)
what are the odds that the elevator will stop at each floor
B)
what are the odds that the elevator will stop at two floors
C)
what are the odds that in the elavator would be 2 tenants from the second floor
regarding A:
we have 3 places to put 3 people so
for the first from we have 3 options the secong one 2 options and on the last floor we have only one person.
so its
[tex]\frac{3*2*1}{(_{3}^{9})}[/tex]
correct?
and i don't know why all the oprions(the expresion in the denominator) is
9 over 3