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A coin is tossed n times. The probability of getting head at least once is greater than 0.8, then the least value of n is (a) 2 (b) 3 (c) 5 (d) 4

A coin is tossed n times. The probability of getting head at least
once is greater than 0.8, then the least value of n is
(a) 2
(b) 3
(c) 5
(d) 4

Grade:upto college level

1 Answers

Amit Jain
askIITians Faculty 32 Points
8 years ago
1-(0.5)n>= 0.8
so
n>=3.
Ans:B

Amit Jain
IITD
AskIITians

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