In a graduation ceremony, students exchange greetings. If everyone greets each other once and a total of 276 greetings were made, how many students were there?
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Answer:
24 STUDENTS
Step-by-step explanation:
C(n,r)=?
C(n,r)=C(24,2)
=24!/(2!(24−2)!)
=24!/2!×22!
= 276 GREETINGS
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