Two numbers $\mathrm { k } _ { 1 }$ and $\mathrm { k } _ { 2 }$ are randomly chosen from the set of natural numbers. Then, the probability that the value of $\mathrm { i } ^ { \mathrm { k } _ { 1 } } + \mathrm { i } ^ { \mathrm { k } _ { 2 } } , ( \mathrm { i } = \sqrt { - 1 } )$ is non-zero, equals\\
(1) $\frac { 1 } { 2 }$\\
(2) $\frac { 3 } { 4 }$\\
(3) $\frac { 1 } { 4 }$\\
(4) $\frac { 2 } { 3 }$