(i) 17
17 ends with 7, so its cube ends with 3. i.e, ones digit in 173 is 3.
(ii) 12
12 ends with 2, so its cube ends with 8. i.e, ones digit in 123 is 8.
(iii) 38
38 ends with 8, so its cube ends with 2. i.e, ones digit in 383 is 2.
(iv) 53
53 ends with 3, so its cube ends with 7. i.e, ones digit in 533 is 7.
(v) 71
71 ends with 1, so its cube ends with 1. i.e, ones digit in 713 is 1
(vi) 84
84 ends with 4, so its cube ends with 4. i.e, ones digit in 843 is 4.
