The value of [1^-2 + 2^-2 + 3^-2] × 6^2
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[1‐² + 2‐² + 3‐²] × 6²
(1 + 1 + 1 ) × 6²
1² 2² 3²
(1 + 1 + 1) × 36
4 9
(36 + 9 + 4) × 36
36
= 49
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