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DBMS Number of serializable schedules

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Consider thw following transactions:-

T1 :- r1(A) w1(A) r1(B) w1(B)

T1 :- r2(A) w2(A) r2(B) w2(B)

a) Number of schedules serializable as t1->t2?

b) Number of schedules serializable as t2->t1?
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