Question

solve this question with detail.

Answer 1

Heya, buddy here is your Answer !!
If you got your Answer, then please mark me as the Brainliest !! ✌✌✌

Answer 2

Hey frnd heres your answer⬇⬇⬇⬇

The first term is (3*1-1)/6 = 2/6 

The nth term is (3n-1)/6 

The average of the first term and the last term is ½ ( 2/6 + (3n-1)/6 ) 
=(2+3n-1)/12 
= (3n+1)/12 

So the sum of the first n terms is
n * (3n+1)/12 = n/12(3n+1). 

✔YOUR ANSWER IS OPTION B✔

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