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

33
44
55
66

LohaHridoy

5 views

2025-01-04 04:42

1 Answers

AhmedNazir

Answer: Option 3

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

5 views Answered 2022-09-01 13:21

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