The first and the last term of A.P. are 7 and 630 respectively. If | Filo
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Class 11

Math

Algebra

Sequences and Series

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The first and the last term of A.P. are and respectively. If the common difference is , how many terms are there and what is their sum?

Correct Answer: Option(a)
Solution: Given that, last term
We know that, last term,




We know   [First term Last term]


Thus
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