Need help with assignment force question

[Aprilshowers]

I am stumped on this question. Can anyone advise?

The electric charge of an electron is -1.6 X 10 to the -19 power C.
What is the force exerted between two electrons separated by one meter?

 

[SGT]

The electrostatic force between two charged particles is
F=\frac{q_1.q_2}{4\pi\epsilon_0.d^2}
where \epsilon_0 is the permitivity of free space and
\kappa = \frac{1}{4\pi\epsilon_0} = 8.9876.10^9 N m^2 C^{-2}

 

[daNAV1GATOR]

My answer is

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