If a belongs to real numbers and \(a_1 , a_2 , a_3, .\ldots, a_N\) belong to real numbers then \( (x - a_1) ^2 + (x-a_2) ^2 + (x - a_3)^2 +\cdots + (x - a_N)^2 \)assumes the least value at \(x = \)

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