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Total Probability Theorem

A rifle man i...

Question

A rifle man is firing at a distant target and has only 10% chance of hitting it. The minimum number of rounds he must fire in order to have 50% chance of hitting it at least once is

[Kurukshetra CEE 1998]

A

7

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B

8

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C

9

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D

6

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Solution

The correct option is A
7

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