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The image of the point A (1,2) by the li...

The image of the point A (1,2) by the line mirror y=x is the point B and the image of B by the line mirror y=0 is the point `(alpha,beta)`, then

A

a. `alpha=1,beta=-2`

B

b. `alpha = 0,beta=0`

C

c. `alpha=2,beta=-1`

D

d. none of these

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