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How Many 21's (Posted on 2024-09-14) Difficulty: 2 of 5
List all integers from 1 to 999, one after another to form a number

12345678910111213...997998999

How many times does the "21" grouping appear in this number?

No Solution Yet Submitted by Danish Ahmed Khan    
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  Subject Author Date
Solutionsolution and checkCharlie2024-09-14 10:52:13
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