Bissoy.com
Doctors Medicines MCQs Q&A

Twelve persons meet in a conference and each person shakes hands with all other persons. How many handshakes takes place between persons.?

Twelve persons meet in a conference and each person shakes hands with all other persons. How many handshakes takes place between persons.? Correct Answer 66

Given:

Twelve persons meet in a conference and each shakes hands with all each other

Formula Used:

nCr = n!/r!(n – r)!

Calculation:

To make a one handshake 2 person were required 

Number of ways in which two people are selected 12C2

∴ Number of ways are 12C2 = 12!/2!(12 – 2)! = 66

Related Questions

Prime minister office hosted a media conference; in the press conference every media person shakes hands with every other media persons. If there was a total of 300 handshakes in the conference, find the number of media persons who were present in the conference.
At the beginning of a party, each person present shook hands with all other people present and there were in all 45 handshakes. In the midst of the party, 2 persons left due to an emergency. Now, the number of males and females present in the party was equal. At the end, each female shook hands only with every female present and each male shook hands only with every male present. What is the total number of handshakes that took place at the party?
There are 28 persons present at a press conference. After the conference they all shake hands with each other. If 7 of them refuse to shake hands at all, then how many hands shakes will be there altogether?
6 people meet for a business lunch. Each person shakes hands once with each other person present. How many handshakes take place?
In a party every person shakes hands with every other person. If there are 105 hands shakes, find the number of person in the party.
`If 11 persons meet at a reunion and each person shakes hands exactly once with each of the others, what is the total number of handshakes?
A kiosk has different shakes and other healthy drinks. 85% of the kiosk’s sales are from selling shakes. Every quarter, the store’s sales, on an average, are Rs. 1,50,000. What is their approximate average monthly sale from health drinks other than shakes?
In a party, every person shakes hands with every other person. If there occur a total of 120 handshakes in the party, how many people were present at the party?
Three varieties of mangoes and four varieties of apples are available for shakes in a juice centre. More than one mango can be used in one shake but same is not the case with apple. Only one apple can be used in one shake. However, apples and mangoes can also be mixed to make shakes. Find the total number of shakes available in the juice centre.
Eight friends— A, B, C, D, E, F, G and H are sitting around a circular table facing the centre. Each one of them likes different brands of television—Onida, Sony, Samsung, Micromax, TCL, LG, Toshiba and Sansui, but not necessarily in the same order. A sits third to the right of the person who likes Sansui. A does not like Samsung. E is not an immediate neighbour of H. C sits on the immediate right of the person who likes Samsung.                                     Neither A nor H likes TCL or a Sony. The person who likes TCL is not an immediate neighbour of the person who likes Sansui. The person who likes Onida sits second to the left of E. The person who likes Onida is an immediate neighbour of the both persons who like LG and Toshiba. Person who likes Toshiba sits third to the right of B. B does not like TCL. F is not an immediate neighbour of A. G is not an immediate neighbour of the person who likes Onida. Only two people sit between the person who likes Toshiba and H. The persons who like TCL and the Sony are immediate neighbours of each other. Which of the following brands of television is liked by H?