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what is the PROBABILITY OF THIS (2)?

Dencology

Full Member
10+ Year Member
Mar 7, 2008
396
0
0
  1. Pre-Dental
guys what does this mean:

two numbers b/w 1 and 30 inclusive are drawn in a contest. what is the probability that both numbers are eve?


they have (15/30)15/30

i thought i should be (15/30)(14/29)

but the answer is (15/30)(15/30)= 1/4

how come? (does this mean that they put the first number back in and then drawn for the second time?)
 

MTD52

Class of 2014
10+ Year Member
5+ Year Member
Sep 10, 2008
625
1
0
New Jersey
  1. Dental Student
guys what does this mean:

two numbers b/w 1 and 30 inclusive are drawn in a contest. what is the probability that both numbers are eve?


they have (15/30)15/30

i thought i should be (15/30)(14/29)

but the answer is (15/30)(15/30)= 1/4

how come? (does this mean that they put the first number back in and then drawn for the second time?)

I haven't done probabilities in years, but I think the only logical explanation is that yes, they put the first number back. It doesn't say that the numbers are kept out, and that's the only thing that makes sense to me
 
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