every person shook hands with each other after the end of the party. how many person were there in the party if 28 times in all hands were shaken
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Let the number of people be x
For a hand shake we need 2 people so selecting 2 person form x can be done in xC2 ways.
Therefore xC2=66
x!/(x-2)!2!=66
x(x-1)/2=66
x(x-1)=132
Solving this we get x=12
So there must be 12 persons in the party. Enjoy!! Thanks.
For a hand shake we need 2 people so selecting 2 person form x can be done in xC2 ways.
Therefore xC2=66
x!/(x-2)!2!=66
x(x-1)/2=66
x(x-1)=132
Solving this we get x=12
So there must be 12 persons in the party. Enjoy!! Thanks.
Sandhyathakur:
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ye nombar bahur purana hi.ak bande ke liye mai nombar kaise chang kar du.ha but adhiktar mera fon band hi rakhri hu aaj kal
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si gyi
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