Question

Find the digit in the units place of the number obtained after evaluating the following expression: 67⁶⁷ x 67⁶⁷ x ...x ...67⁹⁹ x 99⁹⁹ x 99⁹⁸ x ... x 99⁶⁷
a) 1
b) 3
c) 7
d) 9