Math, asked by mittals4478, 9 months ago

The first term of an A.P -3 and the 10th term is 15 find the Sn

Answers

Answered by abdulR786

1

Answer:

a10=a+9d

15=-3 +9d

d=2

Sn=n/2(2a+(n-1)d

Sn=n/2(-6+2n -2)

Sn=n² - 4n

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