MatriX
Level
pending
Given 2 identical spinners divided into four equal parts and numbered 1 -2- 3- 4 what is the probability that the sum of the two spinners will be 3 or 7?
The answer is 0.25.
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1 solution
Create a matrix
1 2 3 4 1 2 3 4 5 2 3 4 5 6 3 4 5 6 7 4 5 6 7 8
There is 2/16 chance to get 3, and 2/16 chance to get 7. Therefore, there is 4/16 or 1/4 chance to get either a 3 or a 7.
Answer: 1/4