Answer: 15252
Even natural numbers 2, 4, 6, ...: \(a = 2\), \(d = 2\), \(n = 123\).
\[S_{123} = \frac{123}{2}[2(2) + 122(2)]\]\[= \frac{123}{2} \times 248\]\[= 123 \times 124 = 15252\]1 answer
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· 24 Oct 2026
AI-verified · Oct 2026
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