How many red balls are in the barrel?

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How many red balls are in the barrel?

by Vincen » Thu Feb 08, 2018 8:44 am
How many red balls are in the barrel?

(1) The probability of pulling out a red ball after one random selection is 2/7.
(2) The probability of pulling out a white ball after one random selection is 5/7.

The OA is the option E.

Why are not sufficient the statements? Experts, may you clarify this for me? I'd be thankful.
Source: — Data Sufficiency |