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The number of tosses that have to be made in order that there is 99% probability of getting at least one head is ?
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- 5
- 7
- 6
- 8
Correct Option: B
Corresponding to n tosses, the Probability of getting no head = (1/2)n and,
Therefore, the probability of getting at least one head = 1 - (1/2)n
Now, 1 - (1/2)n ≥ 99/100
⇒ (1/2)n ≤ 1/100
⇒ n ≥ 7
