1.

a coin is tossed 4 times. if getting a tail is a success ,then the probability of 3 successes is:

Answer»

Flip 1             H                     T
 
Flip 2        H          T          H        T
 
Flip 3     H    T    H    T    H    T   H    T
 
Flip 4    H T H T H T H T H T H T H T H T
 
If you follow down each potential path of flips, you'll find that there are only four paths with exactly three tails making the probability 4/16 or 1/4.



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