How many distinct combinations can be formed, taken 3 at a time, from the following 10 digits: 1, 1, 2, 2, 3, 3, 4, 4, 5, 5. Thank you.
i dunno
A short computer code, in Python, gives the following 30 distinct combinations.
(112, 113, 114, 115, 122, 123, 124, 125, 133, 134, 135, 144, 145, 155, 223, 224, 225, 233, 234, 235, 244, 245, 255, 334, 335, 344, 345, 355, 445, 455)>>Total =30