Question

a box contains 3blue and 4red ball what is the probability that the ball taken out randomly will be red .?​

Answer 1

Total possible outcomes = Total number of marbles

                                      = ( 3 + 2 + 4) = 9  

Let E be the event of not getting a white marble.

It means the marble can be either blue or red but not white.

Number of favourable outcomes =  (3 + 4) = 7 marbles

  ∴ P(not getting a white marble ) = 79  

Answer 2

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Total no of balls=7 balls

No of red balls=4 balls

Probability=7÷4

=1.75