Let a box contains
Total number of marbles in the box is
The total number of ways of drawing
(i)
Given, all the marbles drawn will be blue.
According to question all marbles will be blue if we draw
Thus, the probability for all marbles will blue is,
(ii)
Given, at least one will be green.
The number of ways in which drawn marbles is not green is
The probability that no marble is green is,
Thus, the probability that at least one will be green is