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43 votes
43 votes
Peter wrote a list of all the numbers that could be

produced by changing one digit of the number 200. How
many of the numbers on Peter's list are prime?
Your answer

User Daniel Kng
by
2.8k points

1 Answer

23 votes
23 votes
None.

If you change the first digit:
100, 300, 400, 500, 600, 700, 800, 900

If you change the second digit:
210, 220, 230, 240, 250, 260, 270, 280, 290

If you change the third digit:
201, 202, 203, 204, 205, 206, 207, 208, 209

None of these numbers are prime.
User Mickel
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3.0k points