IIT-JEE Exam

The domain of definition of the function y(x) given by 2^x+2^y=2 is,
(a). (0,1]
(b). [0,1]
(c). (-infinite,0]
(d). (-infinite,1)

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IIT-JEE Other Question
For all complex numbers z1,z2 satisfying |z1|=12 and |z2-3-4i|=5,the minimum value of |z1-z2| is,
(a). 0
(b). 2
(c). 7
(d). 17 In a triangle ABC, let angle C=π/2.If r and R are the inradius and the circumradius resp, of a triangle then 2(r+R) is equal to,
(a). a+b
(b). b+c
(c). c+a
(d). a+b+c