Someone ans it.

For students of class 9-10 (age 14-16)
NABILA
Posts:35
Joined:Sat Dec 15, 2018 5:19 pm
Location:Munshigonj, Dhaka
Someone ans it.

Unread post by NABILA » Wed Feb 20, 2019 8:55 am

Imagine you have $5$ green and $5$ blue balls in a box. 2 balls are taken from the box what is the probability of at least one ball will be blue. What is the probability of those two balls will green
Wãlkîñg, lõvǐñg, $mīlïñg @nd lìvíñg thě Lîfè

samiul_samin
Posts:1007
Joined:Sat Dec 09, 2017 1:32 pm

Re: Someone ans it.

Unread post by samiul_samin » Wed Feb 20, 2019 9:11 am

Probablity of at least $1$ ball is blue=$\dfrac{\dbinom{5}{1}×\dbinom {5}{1}+\dbinom {5}{2}x\dbinom {5}{0}

}{\dbinom {10}{2}}=\dfrac 79$
Probablity of $2$ ball is green=$\dfrac{\dbinom {5}{2}×\dbinom{5}{0}}{\dbinom {10}{2}}=\dfrac 29$

Post Reply