Question

A bag contains red, white and blue pencils. The probability of selecting a red pencil is $\frac{2}{13}$ and that of selecting a blue pencil is $\frac{4}{13}$. Find the probability of selecting a white pencil.

• A. $\frac{6}{13}$
• B. $\frac{7}{13}$
• C. $\frac{3}{5}$
• D. $\frac{2}{5}$

Answer 1

Answer: (B)

$\frac{7}{13}$

P (white pencil)
= Total probability - [P(red pencil) + P(blue pencil)]
= $1-[\frac{2}{13}+\frac{4}{13}]$
= $1-\frac{6}{13}$
= $\frac{7}{13}$.