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are serial schedules counted or not in the concurrent schedules.

The number of concurrent schedules can be formed with 3 transactions having 3, 2 and 1 operations respectively _________.

what is ans

$\frac{(3+2+1)!)}{3!* 2!*1!}$

=60

or 60-3!=60-6=54 (non serial schedules )
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