+1090 You mean a sequence that is written like: 3+6+9+12...+600?
This is called an arithmetic sequence.
For this we use an equation, which is n (f + l) / 2
n is the number of terms, f is the first term, and l is the last term.
In this instance, n = 200, f = 3, and l = 600, so our equation is:
$${\frac{{\mathtt{200}}{\mathtt{\,\times\,}}\left({\mathtt{3}}{\mathtt{\,\small\textbf+\,}}{\mathtt{600}}\right)}{{\mathtt{2}}}}$$
Simplifying, we get:
$${\frac{{\mathtt{200}}{\mathtt{\,\times\,}}\left({\mathtt{603}}\right)}{{\mathtt{2}}}}$$
200 * 603 = 120,600:
$${\frac{{\mathtt{120\,600}}}{{\mathtt{2}}}} = {\mathtt{60\,300}}$$
60,300 is your sum.
+130511 Very nice, Mathematician.......you're gonna' run me out of a job....!!!!
+1090 Thanks. I just learned that formula a couple of days ago thanks to Geno.
