Question

the sum of first term n terms of AP when last term is given is ______​

Answer 1

Answer:

Suppose, S denote the sum of the first n terms of the Arithmetic Progression {a, a + d, a + 2d, a + 3d, a + 4d, a + 5d ……………...}. Hence, the term preceding the last term is l – d.

Step-by-step explanation:

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Answer 2

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• Suppose, S denote the sum of the first n terms of the Arithmetic Progression {a, a + d, a + 2d, a + 3d, a + 4d, a + 5d ……………...}.
• Hence, the term preceding the last term is l – d.
• The term preceding the term (l - d) is l - 2d and so on.
• Therefore, common difference of the given arithmetic series is 7.

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