Just one.
In combinatorials, 123 is the same as 312 and so on.
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6 for example, 123 123 132 321 213 231 312 * * * * * WRONG. Those are permutations, not combinations. There are 8 possible combinations: 123 12 13 23 1 2 3 and finally, the null combination.
easy 123%= 123/100=1.23
There are 30.48 centimetres in one foot. Therefore, rounded to two decimal places, 123 centimetres is equal to 123/30.48 = 4.04 feet.
One yard is equal to 0.9144 metres. Therefore, rounded to two decimal places, 123 metres is equal to 123/0.9144 = 134.51 yards.
Assuming the digits are not repeated, there are four combinations:123, 124, 134 and 234.