A box contains 4 red and 6 blue balls. If one ball is drawn at random, what is the probability that it is red?
Correct answer: A. 0.4
- A. 0.4
- B. 0.6
- C. 0.25
- D. 0.5
Explanation
There are 4 favourable outcomes out of 10 equally likely ones, so the probability is 4 over 10, that is 0.4. The probability of blue is the complement, 0.6, and the two must add to 1. Checking that the probabilities of all outcomes sum to one is a quick verification.
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Logical problems present several conditions about people, objects, events or choices and require their possible arrangements to be tested. They cover constraint-based reasoning, rankings, matching, grouping, scheduling and elimination, with attention to the difference between a complete solution and a possibility that merely satisfies one condition.
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