Solution 43 An urn contains 2 red , 3 green and 2 blue balls If a - Maths - Playing with Numbers

Question

Solution

43 An urn contains 2 red , 3 green and 2 blue balls If a ball is
drawn at random, then find the probability that the ball is not
blue

A   5 7              
                 
          B   10 21 C   2 7
                 
                 
      D   11 21

Sanjari Kalantri · Accepted Answer

Dear Student,

The urn contains 2 red, 3 green and 2 blue balls
 Hence, total number of balls = 2 red balls + 3 green balls + 2 blue balls = 7 balls
 And, number of balls which are not blue = 2 red balls + 3 green balls = 5 balls
∴ Probability that the ball drawn is not blue = Number of balls that are not blueTotal number of balls = 57

Solution 43. An urn contains 2 red , 3 green and 2 blue balls . If a ball is drawn at random, then find the probability that the ball is not blue. A . 5 7 B . 10 21 C . 2 7 D . 11 21

Solution

43. An urn contains 2 red , 3 green and 2 blue balls . If a ball is drawn at random, then find the probability that the ball is not blue.

$A . \frac{5}{7} B . \frac{10}{21} C . \frac{2}{7} D . \frac{11}{21}$