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The Brainliest Answer!
2016-02-22T13:16:00+05:30
The sum of all the probabilities is equal to 1 
So,  x/2 = 1 - 2/3
 x/2 = 1/3
x = 2/3 
1 5 1
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2016-02-23T08:54:50+05:30
We have p(A)+p(A`)=1
given p(A)=x/2
and p(A`)=2/3
x/2+2/3=1
x=2/3
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