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Q 2128101901.    

Assertion : The spheres `x^2 + y^2+z^2 + 2ax + c = 0` and `x^2 + y^2 + z^2 + 2 by + c = 0` touch if `1/a^2 +1/b^2 =1/c`

Reason : Two spheres with centres `C_1` and `C_2` and radii `r_1,r_2` touch each other if ` | r_1 pm r_2 | = | C_1 C_2 |`

A Both A and R individually true and R is the correct explanation of A
B Both A and R are individually true but R is not the correct explanation of A
C A is true but R is false
D A is false but R is true

HINT


Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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