Probability Question 144
Question: A coin is tossed 3 times. The probability of obtaining at least two heads is or Three coins are tossed all together. The probability of getting at least two heads is
[MP PET 1995]
Options:
A) $ \frac{1}{8} $
B) $ \frac{3}{8} $
C) $ \frac{1}{2} $
D) $ \frac{2}{3} $
Show Answer
Answer:
Correct Answer: C
Solution:
Required probability $ ={{( \frac{1}{2} )}^{3}}.{}^{3}C_2+{{( \frac{1}{2} )}^{3}}.{}^{3}C_3=\frac{4}{8}=\frac{1}{2}. $ {Here at least two heads means two heads or three heads}.
BETA
