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Number of serial schedules but not conflict to schedule (S)

S: r1(A),r2(A),r3(A),r4(A),w1(B),w2(B),w3(B),w4(B)

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Number of serial schedules which are view equivalent to S but not conflict equivalent to schedule S

Conflict equivalent Schedule is

T1->T2->T3->T4

view equivalent Schedule are

1. first read same

2. final write same

3. w-R dependency on same on same data item

T4 should be last bcz it is final write. T1,T2,T3 can be in any order for view equivalent. Here read operation doesn't matter bcz it is on single data item

Answer is 3!-1=5

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