Question

The square of which of the following would be an odd number? 

(a) 2821

(b) 7778

(c) 1050

(d) 1312​

Answer 1

(i) 431 – Unit’s digit of a given number is 1 and the square of 1 is 1. Therefore, a square of 431 would be an odd number.

(ii) 2826 – Unit’s digit of a given number is 6 and the square of 6 is 36. Therefore, the square of 2826 would not be an odd number.

(iii) 7779 – Unit’s digit of a given number is 9 and the square of 9 is 81. Therefore, the square of 7779 would be an odd number.

(iv) 82004 – Unit’s digit of a given number is 4 and the square of 4 is 16. Therefore, the square of 82004 would not be an odd number.

Answer 2

The square of which of the following would be an odd number? (a) 2821✔️

(b) 7778

(b) 7778(c) 1050

(b) 7778(c) 1050(d) 1312