Problem 3 from prior weeks.
Correct!
Explanation:
The answer is 4. Consider the series of squares 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121… If you take only the unit’s digit, you get 1, 4, 9, 6, 5, 6, 9, 4, 1, 0, 1 which is the series above. The next square is 144, therefore the answer is its units digit, or 4.