Question

A bowl contains 25 balls numbered 1 to 25. A ball is drawn and its number is noted. Without replacing the first ball, another ball is drawn.
The probability that the numbers on both balls are odd numbers is BLANK
.

Answer 1

P(first odd)*(P(second odd|first odd))

Answer 2

how do i figure out the first odd?

Answer 3

There are 25 balls, what proportion are odd?

Answer 4

12/25

Answer 5

I counted 13, I'll re count.

Answer 6

1 and 25 are odd, so there is an odd number of odd numbers. I get 13.

Answer 7

you're right i misscounted

Answer 8

so then what happens?

Answer 9

What is the Prob. of the second odd, given the first draw was odd?

Answer 10

13/24

Answer 11

oh, not agreed! 12/24. you removed one!

Answer 12

yup. total forgot

Answer 13

so is the answer .26?

Answer 14

I think so...

Answer 15

Yep, I'm sure now.

Answer 16

\[13/25*12/24 + 12/25*11/24 + 12/25*13/24 + 13/25*12/24 = 1\] is why i'm sure.