A fair coin is tossed 100 times . The probability of getting tails an odd number of times is?
Correct Answer: 1/2
Explanation:
The total number of cause is 2100.
The number of favourable cases are 100C1 + 100C3 + ..... + 100C99
= 2100 - 1 = 299
∴ Reqd probability = 299/ 2100 = 1/2
