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There are two lines of defence against an attacking [#permalink]
04 Jan 2005, 11:02
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There are two lines of defence against an attacking
aircraft. 1st is missile and 2nd is anti-aircraft gun.
the respective prob. that the aircraft being hit by
the missile and the gun are 2/9 and 1/8 respcly.
what is the prob. of hitting the aircraft?