Question

The sum of first n terms of the sequence is defined by the formula sn=2n^2+3n.prove that it is in


a.p

Answer 1

s1=5 so a=5
s2=14 so a2=14-5=9
s3=27 so a3=27-9-5=13
.....and so on
therefore 5,9,13 are in ap due its same common difference

Answer 2

Answer:

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