Question

smart question
100 point question
tell me what is wrong in mathematical operation
a=9.999.....
10a=99.999.....
20a-a=90
a=10
9.9999.....=10​

Answer 1

There is no mistake.

This question confused me when I was in 9th...

It comes like that.

It's just round off.

a=9.999.....

10a=99.999999.....

10a-a=99.9999.... -9.99999

=>9a=90

=>a=10.

No mistake.

It is a bit confusing I know but it is like this. ☺

Our teacher told us the same thing...

Thanks!

Hope you understand.☺

Answer 2

it is write question of class 9th