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If a1 , a2 , a3 , a4 , a5 are in A.P. with common difference ≠ 0, then find the value of ∑ i∈ [i = 1, 5] ai when a3 = 2.

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If a1 , a2 , a3 , a4 , a5 are in A.P. with common difference ≠ 0, then find the value of ∑ i∈ [i = 1, 5] ai when a3 = 2.

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As a1 , a2 , a3 , a4 , a5 , are in A.P., 

we have a1 + a5 = a2 + a4 = 2a3 

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