The Formulas are:-
(i) POSITIVE(+) x POSITIVE(+) = POSITIVE(+)
(ii) NEGATIVE(-) x POSITIVE(+) = NEGATIVE(-)
(iii) NEGATIVE(-) x NEGATIVE(-) = POSITIVE(+)
Here are the Examples:
1. King Chandragupta Maurya(Positive) & Durdhara(I assume Positive) =Bindusar (Positive)
2. King Chandragupta Maurya(Positive) & Helena(Negative) = Justine(Negative)
3. Bindusar(Positive) & Charumitra(Negative) = Sushim(Negative)
4. Bindusar(Positive) & Dharma(Positive) = Ashok (Positive)
5. Bindusar(Positive) & Subhrasi(Positive) = Dhrupad(Positive)
6. Justin(Negative) & Noor(Negative) = Siamak(Positive)