Question

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

Answer 1

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.