There are 8 students. 4 of them are men and 4 of them are women. If 4 students are selected from the 8 students. What is the probability that the number of men is equal to that of women? Choices:
A) 18/35  B) 16/35  C) 14/35  D) 13/35  E) 12/35
men= women means 2 men 2 women   total such combinations = 4c2 * 4c2 = 4!/2!.2! * 4!/2!.2! = 6*6   total combinations = 8c4 = 8*7*6*5/4*3*2*1 = 70   so probability = 36/70 = 18/35   hence 18/35
<result>A</result>
There are 8 students. 4 of them are men and 4 of them are women. If 4 students are selected from the 8 students. What is the probability that the number of men is equal to that of women?