FDM Group Interview Question: How many unique handshakes if... | Glassdoor

Interview Question

IT Developer Interview(Student Candidate) New York, NY

How many unique handshakes if each person in a group of

  10 give handshakes out to each and every other individual. (a) 100 (b) 50 (c) 45 (d) 20 (e) 10
Answer

Interview Answer

4 Answers

4

45. Imagine it as a polygon of side 10. Or draw out triangle, square, pentagon, and see the pattern yourself, if you don't know the algorithm.

Interview Candidate on Dec 9, 2010
3

true, or 9+8+7+...+2+1

Dex on Oct 10, 2012
1

Or just do: (10 Combination 2) = 10!/(2!8!) = 45

rhan on Dec 6, 2012
0

n(n+1)/2
Where n =9
Answer: 45

Aram Yayloyan on Apr 20, 2019

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