Question

Eighteen integers are multiplied together. What will be the sign of their product, if:

(¡)15 of them are negative and 3 are positive?

(¡¡)12 of them are negative and 6 are positive?

Answer 1

If 15 of them are negative, then the sign of their product will be negative...
If 12 of them are positive, then the sign will be positive

Remember, while solving questions like these, ignore the no. of positive integers...
If the no. of negative integers is even, all of them will cancel out, hence the answer is positive...
if the no. of negative integers is odd, then one remains negative, hence the product is negative...

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Answer 2

15 of them are negative and 3 are positive