plz answer what??

1. Using FIFO Page replacement algorithm, calculate number of page faults, page hits and calculate page fault, hit ratio using the following reference string 1,2,3,4,2,1,5,6,2,1,2,3,7,6,3,2,1,2,3,6. Consider the frame size =4. Write the C-Program for the same reference string and include the output screens to the word document