Question

Find the sum of first 15 terms of an AP , whose nth term is 3n + 1 ​

Answer 1

Answer:

−195

Step-by-step explanation:

First term, a=1,15th term a15​=3−30=−27

Sum of 15 terms =2n​(a+l(lastterm))=215​(1−27)=15(−13)= −195

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