Probability

busprof

Friends lil help required with probablity.

Suppose i have a 80% Free throw percentage and i have 5 chances out of which i have to make 3 baskets.

I am trying to solve this by 2 different methods, getting correct answer from method 1 but not from second method.


Method 1.


5 nCr 3 = 10 Ways.

(Probability Of Success) * (Probability Of Failure) * Total ways

(.80 * .80 * .80) * (.20 * .20 ) * 10

= 20.480%



Method 2


Prob (a) = event : a true / total # of events

= 10 / 32
= 31.25%


-where total events are 2*2*2*2*2 = 32.



i dont know whats wrong with method 2 or maybe em missing something.