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多分誤植ですね。
マイナスがない状態なら最後がそろいます。

n(log₁₀10-log₁₀12)≦log₁₀2-1
→ -n(log₁₀12-1)≦-(1-log₁₀2)
→ n≧(1-log₁₀2)/(log₁₀12-1)

はる

ありがとうございます!

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