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3421 x 5 is the same as (3421 x 10)/2 = 34210/2 = 17105
The given Roman numerals now represent 3421 in Hindu-Arabic numerals. Note that the ancient Romans would have probably notated the equivalent of 3421 quite differently than how we do today.
2.3063
1234 1243 1324 1342 1423 1432 2134 2143 2314 2341 2413 2431 3124 3142 3214 3241 3412 3421 4123 4132 4213 4231 4312 4321 If you can repeat digits, then there are 256 numbers Without repetition, there are 24
Without repeating any, 1234, 1243, 1324, 1342, 1423, 1432, 2134, 2143, 2314, 2341, 2413, 2431, 3124, 3142, 3214, 3241, 3412, 3421, 4321, 4312, 4213, 4231, 4123, 4132