Mathematics
Mathematics, 02.11.2020 16:50, KOAL

Computers manufactured by a certain company have a serial number consisting of three letters of the alphabet followed by a three-digit number. If all the serial numbers of this type have been used(repetition is not allowed), how many sets have already been Three boys and six girls are being seated in a row of nine chairs on a stage which are numbered from left to right. How many seating arrangements are there if

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