Question

if 30 people handshake with each other then tell the total number of handshakes done among them?​

Answer 1

Answer:

435

Step-by-step explanation:

first person will do 29 handshakes

second will do 28 handshakes

third will do 27 handshakes

and so on..

so the total no of handshakes = 29 + 28 + 27 + 26 + ...

= 29*30/2 = 435

sum of 1+2+...+29=29*30/2