Question

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

• A. $3051$
• B. $2332$
• C. $5684$
• D. $6908$
• E. $50699$
• F. $920546$

Answer 1

Answer: (A), (C), (E), (F)

The correct options are
A $3051$
C $5684$
E $50699$
F $920546$

The square of the numbers must end with any of the digits $0$, $1$, $4$, $5$, $6$ or $9$.
Example:-
$1^2=1$
${12}^2=144$
${13}^2=139$
$5^2=25$
Also, a perfect square has even number of zeros at the end. Example :- $100,400,640000$.
(A)Here, the number is $3051$.
The unit's digit is $1$. Thus, It can be a perfect square.
(B)Here, the number is $2332$.
The unit's digit is $2$. Thus, It cannot be a perfect square.
(C)Here, the number is $5684$.
The unit's digit is $4$. Thus, It can be a perfect square.
(D)Here, the number is $56908$.
The unit's digit is $8$. Thus, It cannot be a perfect square.
(E)Here, the number is $50699$.
The unit's digit is $9$. Thus, It can be a perfect square.
(F)Here, the number is $920546$.
The unit's digit is $6$. Thus, It can be a perfect square.