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Topic: sum of X numbers
Replies: 3   Last Post: Jul 28, 2014 11:16 AM

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Posts: 13
Registered: 8/9/13
sum of X numbers
Posted: Jul 28, 2014 2:22 AM
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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,

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