2,7/4,5/4,13/16,1/2,(  )

2,7/4,5/4,13/16,1/2,(  )A.19/64 B.17/62 C.1/4 D.13/58

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29,78,122,46,8,(  )

29,78,122,46,8,(  )A.34 B.1 C.-2 D.-4

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1,2,5,26,(  )

1,2,5,26,(  )A.31 B.51 C.81 D.677

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10,10,8,4,(  )

10,10,8,4,(  )A.4 B.2 C.-2 D.-4

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22,122,1221,11221,112211,(  )

22,122,1221,11221,112211,(  )A.111221 B.111122 C.1122111 D.1112211

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