Two APs have the same common difference.If the first terms of the APs are 5 and 6 respectively,Find the difference b/w the sum of their 20 terms

let the diff. be d and the first term A=6; a= 5 .. now S20 - s20 = 10(12+19 d) - 10(10+19 d) then 10(12+19 d-10-19 d)= 10(2)=
20. hope u get
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