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Question 1:
There are 20 people in a party. If every person shakes hand with every other person,what is the total number of handshakes?
A. 180
B. 155
C. 145
D. 190
Feedback 1st person will shake hand with 19 other persons. 2nd person will shake hand with remaining 18 persons, and so on.
Therefore, total number of handshakes.
= 19 + 18 + 17+ ……………………+ 3 + 2 + 1 = 19 =(19(19+1)/2) =190
So, the correct answer is option 4.
Therefore, total number of handshakes.
= 19 + 18 + 17+ ……………………+ 3 + 2 + 1 = 19 =(19(19+1)/2) =190
So, the correct answer is option 4.
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