3 Tutor System
Starting just at 265/hour

# 3.The squares of which of the following would be odd numbers? (i) 431 (ii) 2826 (iii) 7779 (iv) 82004

(i) $$431^2$$ is an odd number as the unit's digit is odd.
(ii) $$2826^2$$ is an even number as the unit's digit is even.
(iii) $$7779^2$$ is an odd number as the unit's digit is odd.
(iv) $$82004^2$$ is an even number as the unit's digit is even.