24² has n at its unit place, the value of n is:

1. 4

2. 16

3. 576

4. 6

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

1. 5

2. 25

3. 10

4. 8

Squares of which of the following numbers will have 1 (one) at their unit's place ?

(i) 57

(ii) 81

(iii) 139

(iv) 73

(v) 64

Which of the following numbers will not have 1 (one) at their unit's place ?

(i) 32²

(ii) 57²

(iii) 69²

(iv) 321²

(v) 265²