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rahul harkol

· started a discussion

· 1 Months ago

answer should be 190 (Question: 77225.0 )


Question:
At the end of a business conference the twenty people present all shake hands with each other once. How many handshakes will there be altogether? 
Options:
A) 120
B) 190
C) 170
D) 145
Solution:
Ans: (B)
Clearly, total number of handshakes 

nCr=\(\cfrac{n!}{(n-r)!r!}\)
= 20C2 = \(\cfrac{20!}{18! \times 2!}\) 

190.  

Knowledge Expert

· commented

· 1 Months ago

Dear student,
We have updated the solution.
Keep learning,
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