Question

in a box there are red black and yellow marbles the number of marbles are not red in colour is 12 the number of marbles which are not yellow is 9 and the number of marbles which are not black is 11. a marbles is taken out of the box at random what is the probability that the marble is of black colour​

Answer 1

Step-by-step explanation:

The total number of balls are 28+20+19+13+11+9 = 100 balls

The minimum number of box that give 5 different color balls can be 5 with

favorable cases = 28C1*20C1*19C1*13C1*11C1*9C1 = 28*20*19*13*11*9

exhaustive cases = 100C6 = 100*99*98*97*96*95/1*2*3*4*5*6

The probability of drawing such a combination may be rare but it’s probability can be calculated and is

= 28*20*19*13*11*9/(100*99*98*97*96*95/1*2*3*4*5*6)= 0.011487

So we have to find such a number that we get outcome as 1 that is 1/0.011487 = 87.05128

it means we need atleast 87 withdrawals so that above combination can be attained.