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B
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Difficulty—
A) 18
B) 36
C) 41
D) 45
E) 72
Answer: B
Source: Economist
The diagram above shows all the possible pairs among 5 cats that were marked 1, 2, 3, 4 or 5. If the diagram were extended so as to represent 9 cats, how many different pairs would the diagram show then?
A) 18
B) 36
C) 41
D) 45
E) 72
Answer: B
Source: Economist
A) 18
B) 36
C) 41
D) 45
E) 72
Answer: B
Source: Economist
