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                         Puzzle #321
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            What is the next number in this series?

         10, 100, 110, 1000, 1010, 1100, 1110, ____, ...
           

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                         Puzzle #322
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           What are the missing terms in this series?

            ____, Du0, Trio, Quartet, ____, Sextet           


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                         Puzzle #323
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          What is the next letter in this series?

              E, G, G, C, D, E, F, G, A, ____                   


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                         Puzzle #324
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           What is the nest number in this series?

          12, 15, 21, 24, 30, 33, 39, 51, ____, ...                                 


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                         Puzzle #325
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           What is the nest number in this series?

               7, 8, 6, 9, 5, 10, 4, 11, ____                                 


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