A number theory problem by Don Ramon De Jesus

Number Theory Level pending

100 People had handshake with each other without repeation. How many Possible Handshake will be make?


The answer is 4950.

Don Ramon De Jesus by Don Ramon De Jesus , 32, United Arab Em…

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2 solutions

This is similar to Gauss famous story at school, with the exception that sums will start with 99+1, 98+2... + 50.

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100+99+98+97+96..+5+4+3+2+1=5050 Lol Or n(n-1)/2

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The 100th person only shakes 99 other hands. The sum should be till 99, and not 100.

I have updated the answer to 4950.

Calvin Lin Staff - 6 years, 5 months ago

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Ok i need to check my solution o.o

Don Ramon De Jesus - 6 years, 5 months ago

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