Question

4 people come to a party and shake hands with each other. If each person shakes the hand of every other​ person, how many handshakes​ occur?

Answer 1

@peachpi

Answer 2

@phi @welshfella @Nnesha

Answer 3

3+2+1

Answer 4

6

Answer 5

lol

Answer 6

Lets assume the 4 people are ABC and D ok?

Answer 7

ok

Answer 8

hello

Answer 9

So A shakes hand with the three others: BC and D

Answer 10

@peachpi

Answer 11

ok

Answer 12

ok

Answer 13

then B shakes hand with C and D

Answer 14

kk

Answer 15

kk

Answer 16

At last we have to add the shaking hand between C and D

Answer 17

5 ?

Answer 18

So if we add all we get 3+2+1=?

Answer 19

6

Answer 20

Right try sketching the situation :-)

Answer 21

is that answer

Answer 22

yep

Answer 23

Like this:-) https://sketch.io/render/sketch55e0bed1ee9f1.png

Answer 24

How many double arrows are there?

Answer 25

They are the number of hand shakes :-)