In the given problem, we need to find the sum of terms for different arithmetic progressions. So, here we use the following formula for the sum of n terms of an A.P.,
Where; a = first term for the given A.P.
d = common difference of the given A.P.
n = number of terms
(i) To 11 terms.
Common difference of the A.P. (d) =
= 6 − 2
Number of terms (n) = 11
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