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  1. If   ax + by = 1 and bx + ay =
    2ab
    		 then (x2 + y2)(a2 + b2)is equal to
    a2 + b2
    1. 1
    2. 2
    3. 0.5
    4. 0
Correct Option: A

ax + by – 1 = 0

bx + ay –
2ab
 = 0
a2 + b2

By cross-multiplication.


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