please answer this bcZ last time i didnot get the answer. the page was blank

please answer this bcZ last time i didnot get the answer. the page was blank A bag contains 2 white and 3 black balls. A ball is selected at random. If it is white, it is kept aside and if it is black, it is repalced along with another ball of the same colour. The process is repeated thrice. The probabililty of getting a black ball in third draw is 2 7 11 14 3 (c) 5 1 7