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由於僅考慮個位數位,相鄰的自然數之積1×2=2,2×3=6,3×4=12,4×5=20,5×6=30,6×7=42,7×8=56,8×9=72,9×10=90,10×11=110的個位數位只可能是0,2,6三種.囙此,若一個自然數的個位數位不是0,2,6,那麼,這個…
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