P=1+2+3+...+500

=>P=?

P= 1+2+3+...+500

<=>P= (1+500):2 x 500

P= 501:2 x 500

P= 125250

The term for P is

(500 - 1) + 1 = 500 (skull)

Total P is :

(500 + 1) x 500 : 2 = 125250

Answer : 125250

The term for P is :

So P = 125250