The value of 18² - 17² is :

1. 1

2. -1

3. 35

4. none of the above

The sum of first four odd natural numbers is :

1. 2³

2. 2⁴

3. 4³

4. 4⁴

A number ends with 5 zeros, the number of zeros in its square will be :

1. 5

2. 25

3. 10

4. 8

Seeing the value of the digit at unit's place, state which of the following can be square of a number ?

(i) 3051

(ii) 2332

(iii) 5684

(iv) 6908

(v) 50699