Rina03idn
Answered

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There are 28 students in our class. On Valentines Day, every student gives a valentine to each of the other students. How many valentines were exchanged?

Sagot :

Answer:

There were 378 exchanges of Valentine's greetings.

Step-by-step explanation:

If every student exchanged Valentines greeting to each other, then:

Student 1 to 27

Student 2 to 26

Student 3 to 25

Student 4 to 24

and so on.

Total number of Valentine greetings exchanged = [n (n-1)]/2

Where n = 28

Total = [28 (28-1)]/2

= [28 (27)]/2

= (14)(27)

= 378