Question

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Below is a tree diagram for an event with three possible outcomes. A, B and c. This event occurs twice.

What is the probability of outcome B occurring at least once?

Answer 1

1/2

Explanation:

Total of B is: 4/2

Total of everything is: 8/4 + 4/2 = 8/4 + 8/4 = 16/4

Decimal number of B is: 2

Decimal number of everything is: 4

Answer: 2/4 or 1/2