trunefan4379 trunefan4379
  • 03-09-2017
  • Mathematics
contestada

If 23 people shake each others hands once how many hands are shook in all

Respuesta :

Аноним Аноним
  • 03-09-2017
This is the number of combinations of 2 from 23
 23C2   = 23! / 2! 21!

A quick way to do this   is  23*22 / 2   =   253
Answer Link

Otras preguntas

25t-87.5=12.5 what is the value of t
If humans can see water but not air, can fish see air but not water??
Which combination of factors will produce the largest value for the standard error?
2x + y = 43 x + y = 28
Equivalent fractions for 1/2
John will eat peanut butter and jelly sandwiches only when they are made with exactly two ounces of peanut butter and one ounce of jelly. If peanut butter is on
Transpiration in plants requires all of the following except
Plz solve, find the area for each one, and plz show ur work or explain what u did
I need help please and thank you
QUICK!!!!!! HELP ME PLZ!!!!!!!!!!!!Anita is writing an argument in favor of allowing students to use smart phones in school. She included the following evidence