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The 16th term of an AP is 5 times its 3rd term. If its 10th term is 41, find the sum of its first 15 terms.
Arithmetic Progression | CBSE | Class 10 | Maths | RS Aggarwal
The 16th term of an AP is 5 times its 3rd term. If its 10th term is 41, find the sum of its first 15 terms.

Solution:

Suppose that a is the first term and d is the common difference of an AP, then we have:

i

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