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| Math Central | Quandaries & Queries |
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Question from Donna: I lost my safe combination :( it is 4 digit # with the last digit being 2. |
Hi Donna,
From the way you have worded this I don't think zero is one of the possible digits. Write back if I am wrong.
Starting from the left the smallest usable digit is 4. Go through the possible 2 digit arrangements for digits two an three in numerical. The smallest two digit number without a zero is 11. The next is 12 and so on so the numbers to try are
4112
4122
4132
.
.
.
4192
4212
4222
.
.
.
4992
That is 81 possibilities so far. If none of them work set the first digit to 5 and try again
5112
5112and so on.
Next try the first digit as a 6, and continue.
I hope you find it,
Penny
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