I know the independent concept and multiplication rules. 

**Example Flip Coin**

> 
> 5 times flip, how many times success of Head?
> 
> 
> Ans : $\frac{1}{2} \cdot \frac{1}{2} \cdot \frac{1}{2} \cdot \frac{1}{2} \cdot \frac{1}{2} = \frac{1}{32}$
> 
> 
> 

Why do we use multiplication rules, not other rules?

I know if we use addition then probability $2.5$ which is invalid because probability should be between $0$ to $1$. Same for Subtraction and division.

**But**, I am still confused why we use multiplication? What is the basic and core logic behind this?

Can anyone tell me the concept of this?