The probability of hitting a target is 1/ 2. The least number of times to fire so that the probability of hitting the target atleast once is more than 90% is

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answer is A.

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Detailed Solution

p=12⇒q=12, p(x≥1)>910⇒1−p(x=0)>910⇒110>12n⇒2n>10⇒n=4

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