Virtual Memory - General Questions

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

Belady's anomaly can occur with which replacement algorithm?

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

Demand paging means:

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