The number (ab + ba) is divisible by
11

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Solution

The correct option is A 11
Let a number be ab,
Reversing it as ba.
Now,
Adding ab + ba
= ab + ba
= 10a + b + 10b + a
= 11 (a + b)
$∴$ It is divisible by 11

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The number (ab + ba) is divisible by 11

The correct option is A 11Let a number be ab, Reversing it as ba. Now, Adding ab + ba = ab + ba = 10a + b + 10b + a = 11 (a + b) ∴ It is divisible by 11

The number (ab + ba) is divisible by
11

The correct option is A 11
Let a number be ab,
Reversing it as ba.
Now,
Adding ab + ba
= ab + ba
= 10a + b + 10b + a
= 11 (a + b)
$∴$ It is divisible by 11