At a college party two students knew one other student before the party, and five students knew two other students before the party. The rest of the students knew three other students before the party. A total of 15 pairs of students knew each other before the party. How many students attended the party?
At a college party two students knew one other student before the party, and five students knew two other students before the party. The rest of the students knew three other students before the party. A total of 15 pairs of students knew each other before the party. How many students attended the party?
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Transcribed Image Text:At a college party two students knew one other student before the party, and five students knew two other students before the party. The rest of the students knew
three other students before the party. A total of 15 pairs of students knew each other before the party. How many students attended the party?
O 6
O 13
O 15
O 30
O None of the choices
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