the total number of shake hands in a group of 10 persons to each other are.........

a.45
b.54
c.90
d.10

• 9+8+7+6+5+4+3+2+1=45
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• Ans a)45
  10C2=45
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• c.90 As 1 person can shakehands with 9 person so 10 person in total makes 90 shake hands combinations possible
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• formula n(n-1)/2 = 10(10-1)/2 = 10*9 / 2 = 90/2 = 45
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• A.45
  
  10c2=45
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