A coin is thrown 3 times. What is the probability that atleast one head is obtained?
-
\(\frac {7}{8}\)
- \(\frac {3}{8}\)
- None the above
- \(\frac {1}{8}\)
The correct answer is: A
Explanation
Sample space = {HHH, HHT, HTH, THH, TTH, THT, HTT, TTT}
Total number of possible outcomes = 2 x 2 x 2 = 8
favourable number of outcomes = 7
∴Pr(at least one head) = \(\frac {7}{8}\)
There is an explanation video available .