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A box has cards numbered 1 to 20. One card is drawn. What is the probability that the number is a perfect square?
A1/5
B1/2
C1/4
D4/20
Answer & Solution
Correct answer: A. 1/5
Perfect squares from 1 to 20: 1, 4, 9, 16 (4 numbers). P = 4/20 = 1/5.
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