oppositeemotions oppositeemotions

10-11-2017
Mathematics

contestada

At a party, everyone shook hands with everyone else. There were 66 handshakes. How many people were at the party? Explain.

Respuesta :

dannielle dannielle

17-11-2017

n-the number of people
The first person shake n-1 hands, the second n-2....the last person shake one hand

1+2+3+.....+n-1=n*(n-1)/2=66
⇒ n*(n-1)=66*2=132=12*11
⇒ n=12 people was at the party

Answer Link

Otras preguntas

What type of literary work focuses on traditional values of family, religion, morality, and social reform?

The main goal of China’s first Five-Year Plan under Mao Zedong was to A) seize land and businesses. B)start a cultural revolution. C)spur economic growth. D)la

importance of opening scene in merchant of venice

Thomas Jefferson opposed Alexander Hamilton’s plan to create a national bank primarily because the plan would 1. weaken the nation’s currency 2. increase the

Which element exists as single atoms?

What literary technique does the poet use in these lines from Beowulf? That {sword} was not useless to the warrior now.

Which mixture has the largest particle size?

Which pair of the following cell organelles are responsible for disposing of cellular waste?

How does the use of language in The Declaration of Independence by Thomas Jefferson differ from that in The Crisis by Thomas Paine? It appeals more to reason th

solve 42 div 3 using an area model