Using each of the ten digits 0 through 9 exactly once, and only addition and concatenation (e.g.

arithmetic/digits/equations/ten.digits.sum.100 New

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Using each of the ten digits 0 through 9 exactly once, and only addition
and concatenation (e.g. 21+34+56+...), can you make a sum of 100?

If the only operations you allow are addition and concatenation, you
will only get multiples of 9 as a result, and since 100 is not a
multiple of 9, you will not be able to obtain it.

-- Stephen H. Landrum <slandrum@3do.com>