A bag contains, 7 different black balls and 10 different Red balls, if one by one ball are randomely drawn untill all black balls are not drawn, then probability that this process is completed in `12^(th)` draw, is equal to ;-

A bag contains 10 white and 3 black balls. Balls are drawn one-by-one without replacement till all the black balls are drawn. The probability that the procedure of drawing balls will come to an end at the seventh draw, is

A bag contains 10 white and 3 black balls. Balls are drawn one-by-one without replacement till all the black balls are drawn. The probability that the procedure of drawing balls will come to an end at the seventh draw, is

A bag contains 9 black balls and 12 white balls. one ball is drawn at random. what is the probability that the ball drawn is a black ball.

A bag contains 10 white and 3 black balls. Balls are drawn one by one without replacement till all the black balls are drawn. Then find the probability that this procedure for drawing the balls will come to an end at the rth draw.

A bag contains W white and 3 black balls. Balls are drawn one by one without replacement till all the black balls are drawn. Then find the probability that this procedure for drawing the balls will come to an end at the rth draw.

A bag contains W white and 3 black balls. Balls are drawn one by one without replacement till all the black balls are drawn. Then find the probability that this procedure for drawing the balls will come to an end at the rth draw.

A bag contains W white and 3 black balls. Balls are drawn one by one without replacement till all the black balls are drawn. Then find the probability that this procedure for drawing the balls will come to an end at the rth draw.

A bag contains W white and 3 black balls. Balls are drawn one by one without replacement till all the black balls are drawn. Then find the probability that this procedure for drawing the balls will come to an end at the rth draw.

A bag contain 4 red balls 5 black balls and 6 white balls. if one ball is drawn at random find the probability that the ball drawn is not black

A bag contain 4 red balls 5 black balls and 6 white balls. if one ball is drawn at random find the probability that the ball drawn is red