### Question Asked by a Student from EXXAMM.com Team

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

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

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