it has a factor of 2*3*5=30
what is the biggest number that is a multipule of 30
hmm
9000
9900
9990 is the biggest
30*333=9990
the summation of an arithetic sequence where first term is a1 and last is an and the number of terms is n
[tex]s= \frac{n(a1+an)}{2} [/tex]
30 *2=60
that's 2 terms
30*3=90
30,60,90
3 terms
so 30*n means n terms
9990=30*333 means 333 terms
n=333
a1=30
an=9990
[tex]s= \frac{333(30+9990)}{2} [/tex]
[tex]s= \frac{333(10020)}{2} [/tex]
[tex]s= \frac{3336660}{2} [/tex]
s=1668330
answer is 1,668,330
