In a birthday party, every person shakes hand with every other person. If there was a total of 28 handshakes in the party, how many persons were present in the party?

• suppose de no of person be 10
  den 1st persn will have a 9 hndshake
  2nd persn will have a 8 hndshake
  similarly...........7,6,5,4,3,2,1,0
  9+0=0
  8+1=9
  7+2=9
  6+3=9
  5+4=9
  
  total hndshake =5*9=45
  =tolal no/2*(total no -1)
  ie ans ll be=x/2(x-1)=28
  solving dese ans will be 8
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