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The Problem of the Fifth Week
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Continue the sequence:
      
            0, 4, 10, 18, 28, .....
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The Solution:
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This is so easy.  The differences sequence is the key.

4 - 0 =4
10 - 4=6
18 - 10=8
28 -18=10
__ - 28 should equal 12 because the differences are increasing by two.

=> 28+12=40 is the answer
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