(1 ÷ 3)^-2 + (1 ÷ 4)^-2 + (1 ÷ 5)^-2 - (1 ÷ 6)^-2
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Answer:
14
Step-by-step explanation:
3²+4²+5²-6²
9+16+25-36
50-36
14
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