The squares of which of the following would be odd numbers?
(i) 431
(ii) 2826
(iii) 7779
(iv) 82004
(i) The given number 431 being odd, so its square must be odd.
(ii) The given number 2826 being even, so its square must be even.
(iii) The given number 7779 being odd, so its square must be odd.
(iv) The given number 82004 being even, so its square must be even.
Hence, the numbers 431 and 7779 will have squares as odd numbers.