Comprehension
Sum of first n terms of an arithmetic sequence is n² + 6n.
Question: 1

What is the sum of first 7 terms ?

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When a formula is given for the sum (Sₙ) or the n-th term (aₙ), finding the value for a specific term number is a matter of direct substitution. Don't overcomplicate it by trying to find the sequence first.
Updated On: Mar 16, 2026
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Question: 2

How many terms of this sequence, starting from the first, must be added to get 315 ?

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When solving a quadratic equation for the number of terms n, always remember that n must be a positive integer. Any negative or non-integer solutions should be rejected.
Updated On: Mar 16, 2026
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