Question

In on festival there was 20 peoples were collect .then any people was shakehading with everyone then how many shakehands will be done in that festival​

Answer 1

Answer:

1.216451e17 is your answer

Step-by-step explanation:

hey here,

1 person will shake hand with 19 people as he can't shake hands with him

so here are 19

and it would be performed by other person with 18 as he did with 1

now

total handshake will be

19×18×17×16×15×14×13×12×11×10×9×8×7×6×5×4×3×2×1

=1.216451e17