In a scientific study there are 8 guinea pigs 4 of which are

In a scientific study there are 8 guinea pigs, 4 of which are pregnant. If 3 are selected at random without replacement, find the probability that all are pregnant. Enter your answer as a fraction or a decimal rounded to 3 decimal places.

P(selected all 3 guinea pigs are pregnant)=(4*3*2)/(8*7*6 ) =1/14 =0.071