Question
Question: In order to get at least once a head with probability ≥0.9, the number of times a coin needs to be t...
In order to get at least once a head with probability ≥0.9, the number of times a coin needs to be tossed is
A
3
B
4
C
5
D
None of these
Answer
4
Explanation
Solution
Probability of getting at least one head in n tosses
= 1 - 
Hence least value of n = 4