warraich wrote:Jar contains only Black b, white w and red r marbles. One marble chosen at random. Is the probability marble chosen would be red greater than the proablity that the marble chosen will be white.
1) r/(b+w) > w/(b+r)
2) b - w > r
Almost no math is needed.
Statement 1: r/(b+w) > w/(b+r)
Tells us that the ratio of red to the other colors (blue and white) is greater than the ratio of white to the other colors (blue and red).
In other words, there are more red marbles than white marbles.
Sufficient.
Statement 2: b-w > r.
Rephrased, b > w+r.
No way to determine whether there are more red marbles than white marbles.
Insufficient.
The correct answer is
A.
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