解答篇~~這是項數學挑戰！

問題如下：空格中的數字為？ 1, 2, 6, 42, 1806, ____???

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(1+2)x2=6 (1+6)x6=42 (1+42)x42=1806 (1+1806)x1806=？ -->就是答案啦！

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