Question

a boy contain 2blue and 3green smarties .a smarties is withdrawn and replaced and another one is chosen ..... determine the probability of not drawing 2blue smarties​

Answer 1

Answer:

There are a total of 2 + 3 + 2 = 7 balls

2 balls can be selected from 7 balls in 7C2 = 21 ways

We want to find out the number of ways in which no blue ball is selected

=> Both the balls are selected from the Red-Green set of 5 balls.

2 balls can be selected from the rest Green set in 5C2 = 10 ways

Required probability = 10/21

Step-by-step explanation:

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