Question

the sum of first n terms of three arthematic progressions are S1 S2 and S3 respectively. The first term of is 1 and their common difference are 1, 2 and 3 respectively. prove that S1 + S3 = 2S2​

Answer 1

Answer:

S1 +S3=2S2

Step-by-step explanation:

here, S1=1,S2=2 and S3 =3

now,

here, LHS=S1+S3 and RHS=2S2

S1+S3=2S2

1+3=2×2

4=4

LHS=RHS verified