Question

if unit's digit of 7³ is 3 5then what will be the unit's digit of 7¹¹

Answer 1

7^1 = 7
7^2 = 49
7^3 = 343
unit's digit of 7^4 = 1
unit's digit of 7^5 = 7 ......................
in this way unit's digit of powers of repeat in an order I.e,, 7,9,3,1,7,9,3,1,7,9,3,1.........
so the unit's digit of 7^11 is 3