ANSWERS: 4
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2 is 1x1+1 6 is 2x2+2 42 is 6x6+6 1806 is 42x42+42 ... they are a progression pattern ...
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Sequentially, the next number is formulated by multiplying the last number with its next higher number. 1*2=2 2*3=6 6*7=42 42*43=1806
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3263442
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the simplest expression for the progression would be n + nxn
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