A fruit basket contains 5 red apples and 3 green apples...

[lisa.]

hey

A fruit basket contains 5 red apples and 3 green apples. Without looking, you randomly select 2 apples.
What is the probablility that

a)you will select 2 red apples i got this one
b)you will not select 2 green apples? but not this one.

a)5p2/8p2 = 5/14
b) i really dont know

thanks for the help!

 

[soroban]

Re: A fruit basket contains 5 red apples and 3 green apples.

Hello, Lisa!

A fruit basket contains 5 red apples and 3 green apples.
Without looking, you randomly select 2 apples.
What is the probablility that:
. . (a) you will select 2 red apples?
. . (b) you will not select 2 green apples?

(a) Correct!


(b) Consider the opposite: "you select 2 green apples".

. . .\(\displaystyle P(\tex{2 green apples})\:= \:\L\frac{_3P_{_2}}{_8C_{_2}}\)\(\displaystyle \:=\:\L\frac{3}{28}\)
Therefore: \(\displaystyle \,P(not\text{ 2 green apples}) \;=\;1 \,-\,\frac{3}{28} \;=\;\L\frac{25}{28}\)

 

[lisa.]

thanks

that makes sense thanks!