Sets, Counting & Basic Combinatorics
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Q1.The lights and breaks of 30 bicycles were tested. 27 bicycles passed the lights and 21 passed the brakes test. The light and breaks both failed on one bicycle. How many bicycles passed both tests?
Medium
A
19
B
21
C
20
D
None of these
Venn Diagrams CSS
2024
Correct Answer: A
Correct answer is A: 19