Question

How many terms of the Arithmetic Progression 45, 39, 33, ... must be
taken so that their sum is 180 ? Explain the double answer.​

Answer 1

Explanation:

Let 180 be the sum of its \(n\) terms. \(\therefore\) Sum of first 6 terms = Sum of first 10 terms = 180. Explanation of double answer: Here, common difference is negative.

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