Question

Probability (up to one decimal place) of consecutively picking 3 red balls without replacement from a box containing 5 red balls and 1 white ball is

• A. 0.5

Answer 1

The correct option is A 0.5

Required Probability

$=\frac{{}^5{C}_1}{{}^6{C}_1}\times \frac{{}^4{C}_1}{{}^5{C}_1}\times \frac{{}^3{C}_1}{{}^4{C}_1}$

$=\frac{5}{6}\times \frac{4}{5}\times \frac{3}{4}=\frac{1}{2}=0.5$