diff --git a/journal/2023-09-29.md b/journal/2023-09-29.md index 430d74c1d..c0cd9c647 100644 --- a/journal/2023-09-29.md +++ b/journal/2023-09-29.md @@ -6,7 +6,7 @@ - It is not a multiple of three as its digits don't add up to a multiple. - It is not a multiple of 7 because 210 is (as 21 is 3 * 7) and it's too near. - Consider the hypothesis that it is multiple of 11. - - 220 is a multiple of 11. + - 220 is a multiple of 11 because 22 is. - 220 - 11 is 209. - So 209 is a multiple of 11. What is the other factor? - Consider the hypothesis that it is a multiple of 19.