Q. 35.0( 1 Vote )

Mark the correct A. 11

B.9

C. 7

D. 5

Answer :

Given:


Chances of hitting a target in a trial=10%=


Chances of not hitting the target = 90%=


Total probability = 50%=5


Let number of trials=n


So number of trials missed=n-1 to hit on nth trial


Total probability


= 5





Take log on both sides




n=6.58


n7


So one must hit it seven times.

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