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1/2,1/6,1/12, 1/30,() A.1/42;B.1/40;C.11/42;D.1
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42 . 1 , 3, 4, 1, 9, ()A .5 B .11 C .14 D .64
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:6,12,20,30,42,()。 A.48 B.56 C.60 D.72
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2,6,11,33,14,42,21,()。 A.46 B.66 C.68 D.63
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12, 20, 30, 42, () A.54 B.58 C.52 D.56
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6, -1, 14, 11, 30, ()。A.31 B.42 C.52 D.56
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2 6 12 20 30 ( ) A.38 B.42 C.48 D.56