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Maths & Physics Help

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astarmathsandphysics:
a)He can save, miss, mis
or miss, save, misss
or miss, miss, save
The probability of each is 1/3x2/3x2/3=6/27
Therefore total=3x6/27=18/27=2/3

b)If he fails to save one, then he misses them all ie 2/3x2/3x2/3=8/27

c) he can save, save, miss
or save, miss, save
or miss, save, save
the probability of each is 2/3x1/3x1/3=2/27
therefore total is 3x2/27=6/27=2/9

As for the line and plane thing, if you post questions here I will anser them, If you really want me to summarize the topic tell me first, is this a level or igcse. I think you might be in the wrong board.

sonali:

--- Quote from: astarmathsandphysics on November 01, 2008, 08:51:10 pm ---a)He can save, miss, mis
or miss, save, misss
or miss, miss, save
The probability of each is 1/3x2/3x2/3=6/27
Therefore total=3x6/27=18/27=2/3

b)If he fails to save one, then he misses them all ie 2/3x2/3x2/3=8/27

c) he can save, save, miss
or save, miss, save
or miss, save, save
the probability of each is 2/3x1/3x1/3=2/27
therefore total is 3x2/27=6/27=2/9

As for the line and plane thing, if you post questions here I will anser them, If you really want me to summarize the topic tell me first, is this a level or igcse. I think you might be in the wrong board.

--- End quote ---
hello astarmathsandphysics
thx fr solving d sum
bt ya i still continue to have issues wth this sum as d ans of 1a and 1b does not tally
according to which book i hv taken this frm it says d ans to 1a is 12/27 n to 1b is 26/27
d last ans is correct
n ya as fr d topic d line and between d plane i wldnt mind if u can summarize it
n ya it is fr d igcse level wht i want
thx :D

astarmathsandphysics:
u are right about 1a i said 2x2 is 4. Check it. Check q1b again though

astarmathsandphysics:
am sure 1b is 'probability that he fails to save at least one'

astarmathsandphysics:
i mean he fails to save them all

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