Question

A bag contains 3 white and 7 red balls. If a ball is drawn at random, then what is the probability that the drawn ball is either white or red

• A. 0
• B. $\frac { 3 } { 10 }$
• C. $\frac { 7 } { 10 }$
• D. $\frac { 10 } { 10 }$

Answer 1

Answer: (D)

$\frac { 10 } { 10 }$

Answer 2

Required probability $= \frac { { } ^ { 3 } C _ { 1 } + { } ^ { 7 } C _ { 1 } } { { } ^ { 10 } C _ { 1 } } = \frac { 10 } { 10 }$ .