Question

why we write by pen​

Answer 1

Answer:

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Explanation:

Many people say "in pen" to mean "in ink", i.e. "I wrote it in pen" refers to the fact that it can't be erased rather than the instrument used. By the same logic, you shouldn't say "in pencil" but "in lead" or "in pencil lead". If we were taking the strictly logical route, it would be more logical to say "in graphite".