Question

if the sum of n terms of three A.P.'s
, whose first terms are 1, 2, 3 and common differences 1, 3, 5 respectively are S1, S2, S3, then prove that
S1+ S2 + S3 =3/2n.(3n + 1).
please give the right solulution 11th class maths
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Answer 1

Answer:

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