Four number-pairs are given out of which three are alike in a certain way and one is different. Select the number-pair that is different from the rest.
A18 : 306
B23 : 552
C13 : 182
D25 : 650
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Select the correct combination of mathematical signs that can sequentially replace * to balance the following equation.
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9 ? 11 ? 6 ? 3 ? 9 = 117
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