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how to find total number of concurrent schedule possible when any schedule is given ?

for example consider this schedule

T1 : R1(A) , W1(A) , R1(B) , W1(B) ;

T2 : R2(A) , W2(A) , R2(B) , W2(B) ;

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Number of concurrent schedules = All schedules possible – serial schedule

                                                           =(4+4)!/4!4! – 2!

                                                            = 8!/4!4! – 2

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