Explain the answer please

A small computer has four page frames. At the first clock tick ti, the R bits are 0011 (page 0 is 0, the rest are 1). At subsequent clock ticks, the values are 1011, 1010, 1101, 0010, 1010, 1000, and 1100. If the aging algorithm is used with an 8-bit counter, show the values of the four counters after the last tick in Table 1. 5. Table 1 Counters Page 0 Page 1 Page 2 Value Page 3