Question

The unit digit in the expression ${36}^{234}\times {33}^{512}\times {39}^{180}-{54}^{29}\times {25}^{123}\times {31}^{512}$ will be

• A. 8
• B. 6
• C. 5

Answer 1

The correct option is B 6

It can be seen that the first expression is larger than the second one. Hence, the required answer would be given by the (units digit of the first expression - units digit of the second expression) = (6 x 1 x 1 - 4 x 5 x 1) = (6 - 0). Option (c) is correct.