Find the sum of the following arithmetic progression: 41,36,31,…….to 12 terms.

Explanation

Given that,` 41, 36, 31, … to 12 terms`


Here` n = 12 `


The first term, `a = a_1 = 41 `


Common difference, `d = a_2 – a_1 = 36 – 41 = -5`


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