according to view equivalence definition
1) any write by Ti followed by read by Tj , the same condition should be followed
2) last operation on some item should be same in view equivalence schedule.
all writes are blind writes in the given question.
last write on A is W7(A) . and it should be followed by R8(A). this sequence should be always appear at the end in any euivalence schedule.
remaining 1. W1(A) should be follwed by R2(A)
2. W3(A) should be followed by R4(A)
3. W5(A) should be follwed by R6(A)
these 3 sequences can appear any order so = 3! = 6
please correct me if any mistake.