Multiple choice general knowledge

Every person in a room shook hans with every OTHER person in the room. Totally there were 190 hand shakes .Find the total persons in the room

  1. 90

  2. 19

  3. 20

  4. 10

  5. 21

  6. 95
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

With n people, each person shakes hands with n-1 others, giving n(n-1)/2 unique handshakes total. Solving n(n-1)/2=190 yields n=20, since 20x19=380.

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