In an Ap if the sum of first n terms is.
n²+ 2n, its 18th term is:
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Answer: a+ 38
Step-by-step explanation:
In the attachment
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Sum of the 18th term = (18)^2 + 2 * 18
= 324 + 36
= 360
Sum of 17th term = (17)^2 + 2* 17
= 289 + 34
= 323
Sum of 18 terms - Sum of 17 terms = 18th term
360-323 = 37
So the 18th term is 37.
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= 324 + 36
= 360
Sum of 17th term = (17)^2 + 2* 17
= 289 + 34
= 323
Sum of 18 terms - Sum of 17 terms = 18th term
360-323 = 37
So the 18th term is 37.
Plz mark as brainliest !
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