Count every equally likely outcome.
A bag has 3 red, 2 blue and 5 green counters. One counter is chosen at random, and each counter is equally likely.
Total counters: 3 + 2 + 5 = 10.
Red counters: 3.
P(red) = red counters / total counters = 3/10 = 0.3 = 30%.
The denominator includes every counter, including the red ones.
Learning check: what is P(blue) from the same bag? Pause before checking.
Answer: 2/10 = 1/5 = 0.2 = 20%.
A complete visual lesson for adult GED math learners. Original GED-style practice, not official GED content.
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