hard · GMAT Quant
An automated inventory system generates 4-digit identification codes using the digits 0 through 9. If the first digit cannot be zero
How many such 4-digit integers contain exactly two 7s?
An automated inventory system generates 4-digit identification codes using the digits 0 through 9. If the first digit cannot be zero How many such 4-digit integers contain exactly two 7s?
- 432
- 459
- 486
- 512
- 567
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