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find all two-digit odd number, the sum of whose is 9
9 years ago

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Steve
surely you can list all pairs of digits whose sum is 9.

Then just make sure that the 2nd digit is odd, and you're done. Note that the first digit must be even, if the sum is odd.

The first in your list will be

27

and you can surely list the others.
9 years ago

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