A bag contains 3 red and 7black balls. Two balls are selected at random one by one without replacement. If the second ball happens to be red, what is the probability that the first selected ball is also red?

A bag contains 3 red and 7 black balls. Two balls are selected at random one-by-one without replacement. If the second selected ball happens to be red, then what is the probability that the first selected ball is also red?

A bag contains 3 red and 7 black balls, two balls are taken out at random, without replacement, If the first ball taken out is red, then the probability that the second taken out red ball is

A bag contains 5 white, 7 red and 3 black balls. If three balls are drawn one by one without replacement, find the probability that none is red.

A bag contains 5 white, 7 red and 3 black balls. If three balls are drawn one by one without replacement, find the probability that none is red.

A bag contains 5 white, 7 red and 3 black balls. If three balls are drawn one by one without replacement, find the probability that none is red.

A bag contains 5 white, 7 red and 3 black balls. If three balls are drawn one by one without replacement, find the probability that none is red.

A bag contains 5 white,7 red and 3 black balls.If three balls are drawn one by one without replacement,find the probability that none is red.

A bag contains 6 red balls and 10 green balls. 3 balls are drawn from it one by one randomly without replacement. If the third ball drawn is red, then the probability that first two balls are green is: