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If you wrote down all the numbers from 1...

If you wrote down all the numbers from 1 to 99, then how many times would you have written '7'?
यदि आपने 1 से 99 तक की सभी संख्याओं को लिखा है, तो आपने “7 को कितनी बार लिखा है ?

A

19

B

21

C

18

D

20

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