One sixth of the lions are male. how many lions are at the zoo

The number if marbles of different colors stored in a hat is listed below: 4 red marbles 10 green marbles 7 blue marbles. without looking in the hat, dan takes out a marble at random. he replaces the marble and then takes out another marble from the hat. what is the probability that dan takes out a blue marble in both draws?

If np3 /nc2 = 6, find the value of n

The number 72 lies between what perfect squares