Question
Rashi asked Aarush to take a two digit number and then reverse the digits. After that, she asked him to add the first number and the new number, then divide it by 11. She asked him do you get a remainder ? Aarush's reply will be -
Answer: Option B
:
B
Let's take a two digit number 'ab'. Its general form is10×a + 1×b. Whenwe reverse the digits,the new number will be of the form 10×b + 1×a.
If we add boththe numbers we get
(10×a + 1×b) + (10×b + 1×a)
=10a + b + 10b + a
= 11(a+b)
Hence when divided by 11 it will notleave any remainder.
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:
B
Let's take a two digit number 'ab'. Its general form is10×a + 1×b. Whenwe reverse the digits,the new number will be of the form 10×b + 1×a.
If we add boththe numbers we get
(10×a + 1×b) + (10×b + 1×a)
=10a + b + 10b + a
= 11(a+b)
Hence when divided by 11 it will notleave any remainder.
Was this answer helpful ?
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