Question 1026293
a.  (10/22)(9/21)(8/20)=0.0779 (30/385)
b.  The denominator is 22*21*20*19
The numerator is 6 ways this can happen, which will contain the number 10*9*12*11
two red then two white would be 10/22 * 9/21 *12/20*11/19.
The numerator is 71280
The denominator is 175560.  The probability is 0.4060
c.When the first two are white, there are 20 flowers left.  The probability that the third flower is red is 10/20 or 1/2.