The second and the last term of an A.P. are 18 and 720 respectivel | Filo
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Class 11

Math

Algebra

Sequences and series

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The second and the last term of an A.P. are and respectively and their common difference is . What is their sum?

Correct Answer: Option(b)
Solution: Given that, ; last term,



We know that, last term,





We know  [First term Last term]


Therefore,
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