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CAT 2015 Quantitative Ability

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Question : 5

Total: 34

There are 40 students in a class. A student is allowed to shake hand only once with a student who is taller than him or equal in height to him. He can’t shake hand with anyone who is shorter than him. Average height of the class is 5 feet. What is the difference between the maximum and minimum number of handshakes that can take place in the class?

[
40
C
2
2
−20]
361
40
C
2−40
40
C
2

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