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(i) "Confound" is appropriately used to mean "challenge or confuse" conventional theories. (ii) In this sentence "confound" is used correctly to mean "bewilder or puzzle" the observers. (iii) "Confound" is not used properly here; the context suggests addressing or mitigating disparities, not confusing or complicating them. hence, option 3 is the correct answer.
15.975 ×27.825 + (76.01)² + 12.98×18.426 = ?+ (79.09)²
3 8 26 93 ? 1985 11940
...2, 2, 6, 30, ?, 1890
7 7 28 252 ?
...25 54 ? 228 460 924
...5, 12, 24, 36, 52, ?
60, 100, 160, 240, ?, 460
18 19 34 111 428 2165 ?
...150 - 10× ( 7 - 2)/4× 8 = ?
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