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Please answer this question

The product of 13 integer numbers is positive. From this intormation we can
deduce that it is necessarily true that:
a)If (a) all factors are positive.
b) one factor is positive and 12 factors are
negative.
(с) 7 factors are positive and 6 factors are
negative.
(d) there is an odd number of positive
factors (in the product),
(е) at least two factors are negative.
Which answer is correct and why ?
английский язык обучение     #1   28 июн 2017 15:45   Увидели: 6 клиентов, 5 специалистов   Ответить
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It ought to be clear that if a product of n integer numbers is positive then we can deduce:

1) there is an even number of negative factous in the product;

2) among the factors there is no zero.

Thus (d) is the correct answer (indeed [m]13-2n[/m] is an odd number).

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