perplexus.info :: Just Math : How Many 21's

How Many 21's (Posted on 2024-09-14)

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
	solution and check	Charlie	2024-09-14 10:52:13

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