Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:
There are two lines of defence against an attacking [#permalink]
04 Jan 2005, 11:02
0% (00:00) correct
0% (00:00) wrong based on 0 sessions
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?