Virtual Memory - General Questions

How many page faults occur with LRU page replacement and 3 initially empty frames for the reference string: 5, 5, 0, 5, 2, 5, 2, 6, 4, 6, 1, 4, 1, 3

How many page faults occur with FIFO page replacement and 4 initially empty frames for the reference string: 1, 4, 5, 5, 6, 6, 0, 3, 1, 6, 4

How many page faults occur with FIFO page replacement and 3 initially empty frames for the reference string: 3, 4, 4, 5, 3, 4, 0, 5, 3, 6, 3, 1, 0, 5

Thrashing is:

How many page faults occur with Optimal page replacement and 3 initially empty frames for the reference string: 6, 6, 6, 1, 2, 2, 3, 5, 5, 5, 0, 1, 0