itisSheldon wrote:
There are only apples and oranges in a box. What is the probability that the fruit selected at random from the box is an apple?
1) There are 2 apples in the box.
2) The ratio of the number of apples to the number of oranges is 1 to 4.
Only Apple (a) and Orrange (o) in the box.
1. Information only for
a, nothing for
o ------------>NS
2. a:o=1:4 ------------->Suff
say a=1 & o=4 , =>n=5 hence P(a) = \(\frac{a}{n}\)= \(\frac{1}{5}\)
or say a=2 & o=8 , hence P(a) = \(\frac{a}{n}\)= \(\frac{2}{10}\)= \(\frac{1}{5}\)
Thus
Ans B
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Please let me know if I am going in wrong direction.
Thanks in appreciation.
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81% (00:25) correct 
