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nth Term of A.P

The differenc...

Question

The difference between a two digit given number $(a b)$ and the number obtained by interchanging the digits $(b a)$ is $27$ . Then find $a - b$

A

3

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B

5

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C

7

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D

9

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Solution

The correct option is A $3$
$(10 a + b) - (10 b + a) = 27$
Or $9 (a - b) = 27$
Or $a - b = 3$

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