Here blind write perform by w1(B) and w2(B) , blind write means write before read.
now, w3(B) is fixed due to the rule "last operation on some item should be same in view equivalence schedule."
so leaving w3(B) we have 5 schedule, we can arrange them in 5! = 120 way .
r3(A) can be arranging 2! way
r2(A) can be arranging 2! way
so total number of view equal schedule possible (120 / 2! 2! ) = 30
in all these 30 schedules w3(B) is last transaction , it's fixed.
so number of view equal schedule is 30 .
And remember view equal is different from view equal to a serial schedule.
View equal schedule = (concurrent + serial ) schedule
View view-equivalent schedules to a serial schedule = only serial schedule to consider
the difference is the word " serial " !!
In this question only view equal is asked .
hope this is clear now ...