Question

consider arithmetic sequence 6,10,14.find the algebraic form of sum of first n terms​

Answer 1

Step-by-step explanation:

a=6

d=10-6=4

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

Sn=n/2(2(6)+4n-4)

Sn=n/2(8+4n)

Sn=n(4+2n)

Answer 2

Answer ☝️

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