At a business school conference with 100 attendees, are there any students of the same age (rounded to the nearest year)

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At a business school conference with 100 attendees, are there any students of the same age (rounded to the nearest year) who attend the same school?

(1) The range of ages of the participants is 22 to 30, inclusive
(2) Participants represent 10 business schools.

Answer: C

Source: GMAT Prep
Source: — Data Sufficiency |