The sum of the first 10 terms of an AP is 30 and the sum of the first 40 terms is 90. Find the first term of the AP and the least value of r such that the rth term is negative. I need the complete and clear solution please.
The sum of the first 10 terms of an AP is 30 and the sum of the first 40 terms is 90. Find the first term of the AP and the least value of r such that the rth term is negative. I need the complete and clear solution please.
Intermediate Algebra
10th Edition
ISBN:9781285195728
Author:Jerome E. Kaufmann, Karen L. Schwitters
Publisher:Jerome E. Kaufmann, Karen L. Schwitters
Chapter1: Basic Concepts And Properties
Section1.CR: Review Problem Set
Problem 67CR: A crime-scene investigator has 3.4 ounces of a sample. He needs to conduct four tests that each...
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The sum of the first 10 terms of an AP is 30 and the sum of the first 40 terms is 90. Find the first term of the AP and the least value of r such that the rth term is negative.
I need the complete and clear solution please.
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