A number when divided by 7 leaves remainder of 4. If the square of the same number is divided by 7, then what is the remainder?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 2.
Calculations:
Let the number that is divided by 7 and leaves remainder 4 be 11.
Square of 11 = 121
Required remainder = 121/7 = 7 × 17 + 2
Hence, remainder = 2