Question

pls solve this A.P. sum step by step​

Answer 1

Answer:

Step-by-step explanation:

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Answer 2

Sn = n/2 {a + l)
S1 = n/2 { 2+2n}
= n/2 × 2 {1 + n}
= n{1 + n)

S2 = n/2{1 + 2n-1 }
= n × n
= n^2

thus, the ratio is of S1/S2 = {n(1+n)} / n^2 = (n+1)/n