1.

What is the number that is always a factor of the sum of a 2-digit number and a number obtained by interchanging the digits of the number?1. 52. 33. 114. 9

Answer» Correct Answer - Option 3 : 11

Calculation:

Let two digit number be 10a + b and number after interchanging digits be 10b + a.

⇒ 10a + b + 10b + a = 11a + 11b = 11(a + b)

∴ From above, 11 is always a factor of their sum.



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