In order to get at least once a head with probability $ \ge 0.9,$ the number of times a coin needs to be tossed is
In order to get at least once a head with probability $ \ge 0.9,$ the number of times a coin needs to be tossed is
- A
$3$
- B
$4$
- C
$5$
- D
None of these
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- [IIT 1971]
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