Question

write the sum of nth term of an ap if a and last term an =15 given​

Answer 1

Answer:

First term, a=1,15

th

term a

15

=3−30=−27

Sum of 15 terms =

2

n

(a+l(lastterm))=

2

15

(1−27)=15(−13)=−195

Step-by-step explanation:

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