Question

if three marbles are picked at random what is the probability that at least one is blue

Answer 1

U have not given the colours of the marbles... so how can it be answered?
but still if one marble is blue and other two are of different colours, then:
probability of getting a blue one is :::1/3....
ND if two marbles are of blue colour and remaining one is of some different colour,then
probability of getting a blue marble is::::2/3
ND If all are of blue colour, then::
probability of getting a blue one::3/3=1..
ND if no one is of blue colour, then probability of getting a blue marble is :::0/3=0....

Answer 2

u hv not given the colors ...so it cant be answered