If an unbiased dice is rolled thrice, then the probability of getting a greater number in the $i ^ { \text {th} }$ roll than the number obtained in the $( i - 1 ) ^ { \text {th} }$ roll, $i = 2,3$, is equal to\\
(1) $3 / 54$\\
(2) $2 / 54$\\
(3) $1 / 54$\\
(4) $5 / 54$