Question

If the unit's digit of cube of a number is $6$, then what is the unit's digit of the number itself?

• A. $2$
• B. $4$
• C. $6$
• D. $8$

Answer 1

Answer: (C)

$6$

Given, the units digit of cube of a number is $6$.
Any number having $6$ in it's unit's place will have a $6$ in the unit's place of cube.It can be observed $...6\times ...6\times ...6=......6$

Therefore if the unit's digit of the cube is $6$, the number must have $6$ in it's unit's place.

Hence, option $C$ is correct.