Math
posted by Rae .
For n repeated independent trials, with constant probability of success p for all trials, find the probability of exactly x successes. Round your answer to four decimal places
n = 10, p = 1/7, x = 3
A. 0.1189
B. 0.1546
C. 0.1308
D. 0.1427

I believe I answered the question, just find the probability of
7 failures ( a 6/7 chance each time)
3 successes (a 1/7 chance each time)
Then multiply. 
B
.1546