The sum of the first n terms of an AP with first term a and common difference d is
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Answer: A. n/2 [2a + (n − 1)d]
This is the standard formula Sₙ = n/2 [2a + (n − 1)d].
Tap an answer to check.
Answer: A. n/2 [2a + (n − 1)d]
This is the standard formula Sₙ = n/2 [2a + (n − 1)d].