Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
NCTM or The Math Forum.


kalpana
Posts:
13
Registered:
8/9/13


sum of X numbers
Posted:
Jul 28, 2014 2:22 AM


I have to find the X value for which \sum_(i =1)^X (i * a_i ) >= B . Here, a_i & B are known.
For find X value; is there any explicit formula? If anyone knows, please answer.
Thank you very much, kalpana



