Complement ruleeasyFree question
Complement rule Numerical Reasoning Question
The probability of an event is 3/8. What is the probability it does NOT happen?
A137.5%
B166.7%
C60.0%
D62.5%
E37.5%
Worked solution
Complementary events sum to 1: P(not A) = 1 − P(A). The correct answer is 62.5%. Traps to avoid: 137.5% comes from the "added not subtracted" error; 166.7% comes from the "wrong base" error; 60.0% comes from the "odds" error; 37.5% comes from the "gave the event" error.
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