Question

A Jar has five red marbles in at 10 blue ones if you randomly pick a marble without replacing it and then select another what is the fractional probability of getting two red?

Answer 1

Answer:

2/21

Step-by-step explanation:

We know that there is a jar which has 5 red marbles and 10 blue marbles in it.

We are to find the fractional probability of getting two red marbles if we randomly pick a marble and then without putting it back we pick another one.

P (getting red marble on first time) = $\frac{5}{15} =\frac{1}{3}$

P (getting red marble on second time) = $\frac{4}{14} =\frac{2}{7}$

P (getting two reds) = $\frac { 1 } { 3 } \times \frac { 2 } { 7 } = \frac { 2 } { 2 1 }$