Statisticshard · Past Paper
What is the probability that a randomly chosen 2-digit number is divisible by 3 but not by 6?
A15/90
B1/6
C1/10
D20/90
✓ Correct Answer: A — 15/90
Divisible by 3: {12, 15, ... 99} (30 numbers). Divisible by 6: {12, 18, ... 96} (15 numbers). 30 - 15 = 15 numbers. 15/90.
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