SOLUTION: Boomboom joined Scout Jamboree. Every scout was said to handshake with each other. Some of them did not do. The total number of handshakes was 7. Find the minimum number of hands

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Question 549499: Boomboom joined Scout Jamboree. Every scout was said to handshake with
each other. Some of them did not do. The total number of handshakes was 7.
Find the minimum number of handshakes which were not done?
Answer by sudhanshu_kmr(1152) About Me  (Show Source):
You can put this solution on YOUR website!

If total number of persons = n
number of handshakes = nC2
For 2,3,4, 5, 6... people number of handshakes will be 1,3,6,10,15.... respectively.
Because here 10 is smallest value greater than 7.
minimum number of handshakes which were not done = 10-7 = 3

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