## Someone ans it.

For students of class 9-10 (age 14-16)
NABILA
Posts: 23
Joined: Sat Dec 15, 2018 5:19 pm
Location: Munshigonj, Dhaka

### Someone ans it.

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: 999
Joined: Sat Dec 09, 2017 1:32 pm

### Re: Someone ans it.

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\$