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How many times must a man toss a fair...

How many times must a man toss a fair com so that the probability of having at least one head is more than 90%?

A

2

B

4

C

5

D

3

Text Solution

Verified by Experts

` 1 - ( 1 ) /(2^n ) gt (9 ) /(10) rArr (1 )/(2^n ) rArr 2 ^n gt 10 " " therefore ` minimum value of ` n ` is 4
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