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Subject :IMO    Class : Class 5

What is the least number of squares that must be added, so that the line AB becomes a line of symmetry?

A 1
B 2
C 3
D 4

this is a very simple question please give difficult sums

Ans 1:

Class : Class 5

Ans 2:

Class : Class 2
SOF Olimpiad TRAINER has always gone wrong as I tick the correct answer but that shows that I'd ticked a ttally different answer.

Ans 3:

Class : Class 5

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