Question

evaluate (½) -² + (¼) -² +(⅙)-²​

Answer 1

$( \frac{1}{2} ) {}^{ - 2} + ( \frac{1}{4} ) {}^{ - 2} + ( \frac{1}{6} ) {}^{ - 2}$

${2}^{2} + {4}^{2} + {6}^{2}$

$4 + 16 + 36$

$56$

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Answer 2

hence the right answer is 49/144