Question

A researcher wants to conduct a genetic study using 12 randomly-selected volunteers. He has a group of 24 volunteers to choose from. 12 are males and 12 are females. What is the probability that the randomly-selected group will be all male OR all female?
A. 1/2,704,156
B. 1/1,352,078
C. 1/5,408,312
D. 2,395,008/6,476,475,255

Answer 1

@shamil98

Answer 2

# of ways to succeed:: 12C12 + 12C12 = 2
----
# of possible groups of 12:: 24C2 = 276

----
P(all male or all female) = 2/276 = 1/138

Answer 3

so which answer choice?

Answer 4

but it isn't one of the choices..

Answer 5

maybe D?

Answer 6

Probably

Answer 7

The ratios of these answer choices are ridiculous though.