Math, asked by kiratsyal789, 9 months ago

In a box there are 3green,4red and 5yellow balls.If two balls are selected at random them find the probaility that at least one red ball

Answers

Answered by tomholland7373
2

Answer:

The probability of picking a ball from a bag is the number of balls of that colour divided by the total number of balls. Therefore in the first instance, the probability of a red ball is 3/9 or 1/3rd. If that ball is now removed the probability of picking a 2nd is 2/8 or 1/4

Step-by-step explanation:

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Answered by Paruthelegend
1

Answer:

31/72

Step by step

The probability that the first box ( out of 2) is picked is 1/2.

The probability that a blue is picked from the first box (after choosing the box) is 4/9 (4 blue balls from a total of 9)

Similarly probability that a blue is chosen from the second is 5/12 (5 blue balls from 12).

You need to multiply the above probabilities by half since the probability of picking the box itself is half.

So total probability = 1/2*4/9 + 1/2*5/12

= 4/18 + 5/24 = 16/72 + 15/72 = 31/72

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