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15504 different sets of 5 numbers in each.
This is a combination of 5 from 20:
20C5 = 20!/(20-5)!5!
= 20x19x18x17x16/5x4x3x2x1
= 15504.
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∙ 11y ago
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The question to help my son with his homework is: How many unique numbers can be formed by combining three sets of three digital decimal numbers
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