The average of the two-digit numbers which remain the same when…

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The average of the two-digit numbers, which remain the same when the digits interchange their positions, is-

  1. A. 33
  2. B. 44
  3. C. 55
  4. D. 66

Answer: Option C

Here is complete explanation of The average of the two-digit numbers which remain the same when….

Solution(By ExamCraze Team)

Average
$$ = frac{{11 + 22 + 33 + 44 + 55 + 66 + 77 + 88 + 99}}{9}$$
$$ = frac{{left( {11 + 99} right) + left( {22 + 88} right) + left( {33 + 77} right) + left( {44 + 66} right) + 55}}{9}$$
$$eqalign{ & = frac{{4 times 110 + 55}}{9} cr & = frac{{495}}{9} cr & = 55 cr} $$

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