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S1 and S2 DOUBTS HERE!!!!

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narnia:
a fair dice is thrown once. what is the probability that the score is greatr than 3 or a prime number or both?
i added 3/6 + 3/6 + ( 3/6*3/6) , my ans being 5/4 wherews ans given is 5/6 =s

EMO123:

--- Quote from: narnia on April 21, 2011, 09:00:28 pm ---a fair dice is thrown once. what is the probability that the score is greatr than 3 or a prime number or both?
i added 3/6 + 3/6 + ( 3/6*3/6) , my ans being 5/4 wherews ans given is 5/6 =s

--- End quote ---

(x>3)=4,5,6
p of (x>3)=3/6
(x a prime number)= 2,3,5,   
p of (x a prime number)
So both =2,3,5 and 4,5,6

5 is repeated so (2,3,4,5,6)=p of both 5/6
the Question was to confuse you .

ashish:
rex has an old car. the probability that he is able to start the car on a rainy day is 0.2 and the probability that he is able to start it on a fine day is 0.6 . if the weather is either fine or rainy, and probability the weather is fine is p, the find in terms of p
1) the probability that he is unable to start the car on a day
2) the conditional probability that a day is fine and he is unable to start the car?

can someone solve this question please ???

astarmathsandphysics:
One mo

astarmathsandphysics:
prob solved in attachment

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