You have all the info you need to solve for F, just plug everything in.
F = (8.99 × 10⁹ N•m²/C²) (6.0 × 10⁻¹⁰ C) (2.3 × 10⁻¹⁵ C) / (2 m)²
(You're missing the units on d, but I'll just assume meters.)
F ≈ 3.10 × 10⁻¹⁵ N
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