Write from “1” to “525”: 1234567891011121314…524525. how many times have the digit “5” been written?

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1. Đáp án:

    100 số 5

   Giải thích các bước giải:

    123456789101112131415161718192021222324252627282930….524525 

   ⇒ If you write “1” through “525”, you will have 100 digits 5

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