EVALUATING EFFECTIVENESS OF IRON CONDOR AND SHORT STRANGLE STRATEGIES AS HEDGING INSTRUMENTS FOR NIKKEI 225 INDEX: A STANDARD AND ANTITHETIC MONTE CARLO APPROACH - Lesmana, Donny Citra; Mardiansyah, Dicky; Sitorus, Fernando Alonso; Mustafa, Olivia Putri (BAREKENG: Jurnal Ilmu Matematika dan Terapan, 2026)