SSC CGL 17 Aug 2021 Shift 3 Paper

Question : 2 of 100

Marks: +1, -0

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?

Validate

Solution:

At press conference total 28 people are there and 7 people refuse to shake hand. Remaining

=28-7=21

people
Total number of shake hand

\;\; =\;{n(n-1)}/{2}=\;{21 × 20}/{2}

\;\; =21 × 10

\;\; =210

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