Question

Find the chance of throwing 2 blue balls in succession from a bag containing 5 red and 7 blue balls, if the balls are not being repeated.

• A. $\frac{3}{13}$
• B. $\frac{21}{64}$
• C. $\frac{7}{22}$
• D. $\frac{21}{61}$

Answer 1

The correct option is C $\frac{7}{22}$

$Probabilityofgettingblueballinsingledrawis$

$\frac{7}{12}$

$andprobabilityofgettingblueballinseconddrawis$

$\frac{6}{11}$

$So,\frac{7}{12}\times \frac{6}{11}=\frac{7}{22}$