Question 588430
Assuming the deck has 52 cards.
Combination=nCr=n!/((n-r!)*r!)
a)
26 cards are black
(26C3)/(52C3) = 2/17
.
b)
13 cards are diamonds and 39 cards are non diamonds.
((13C1)(39C2))/52C3 = 741/1700
.
c)
13C3/52C3 = 11/850
.
Ed