GRE Math Quantitative Comparisons Question 654

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Source: BOOST

Each person at a party shook hands exactly once with each of the other people at the party. There was a total of 21 handshakes exchanged at the party.

Quantity A

The number of people at the party

Quantity B


  • A Quantity A is greater.
  • B Quantity B is greater.
  • C The two quantities are equal.
  • D The relationship cannot be determined from the information given.

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