Question

18 integers are multiplied together what will be the sign of the product if:
i) 15 of them r negetive and 3 r positive
ii) 12 of them r negative and 6 r positive
iii) 9 of them r positive and the remaining r negative
iv) all r negative​

Answer 1

i) -

ii) +

iii) -

iv) +

even no. of negative signs make positive sign