Memory management

Question

If a virtual memory system has 4 pages in real memory and rest must be swapped to disk.which of the following is the hit ratio for the following page address stream? Assume that memory starts empty .use the first in first out(FIFO) algorithm.
(a) 10%
(b) 15%
(C) 25%
(d) 31%

Comments

for the following page address stream

Where is the address stream?

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this question is from computer science and information technology by Gk mithal.

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ya , something is Missing in this question....

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but question is same as that i given.