Question

find the sum of the first n terms of
the series
2 +6 +12 + 20+​

Answer 1

Step-by-step explanation:

Click on the image for solution

Answer 2

Answer:

answer is 2n2

Step-by-step explanation:

we know sum formula is sn=[n/2(2a+(n-1)d)]

putting the values in the above equations,

a=2

d=6-2=4

[n/2(4+(n-1)4]

answer is--------------> 2n2

hope this helps:)