If we reverse the number 121 and add 8 to it, we get:

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129

130

131

None of the above

answer is A.

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Detailed Solution

Concept- A system of writing numbers is known as a number system. It is the mathematical notation for consistently employing digits or other symbols to represent the numbers in a particular set. It represents the arithmetic and algebraic structure of the numbers and gives each number a distinct representation. We can perform mathematical operations like addition, subtraction, and division using it as well.
121 is a palindrome number.
Palindrome numbers are those which when reversed remain the same.
If we reverse 121, we get 121, such numbers are called palindrome numbers.
So, when we reverse 121 and add 8,

So, 129 is the correct answer.
Since,

,2 and 3 cannot be the correct answers.
Hence, the correct answer is option 1) 129

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