If we multiply a positive number and a negative number, is the result positive or negative?

2 answers:

6 0

The result of any multiplication done with a negative number results in the sum of the two or more numbers to be negative.

Paha777 [63]3 years ago

4 0

Answer:

always negative

Step-by-step explanation:

That is, if you exclude 0. If you count zero as a positive number, that will be the exception to the rule. Luckily, zero is usually considered neither negative or positive.

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A bowl contains 10 balls, of which 4 are red and 6 are white. Balls are randomly selected with replacement from the bowl until 4

guapka [62]

Answer:

The probability that X is 6 = 0.2508

Step-by-step explanation:

Probability of picking a red ball = 4 / 10 = 0.4

Probability of picking a white ball = 6 / 10 = 0.6

Let's first state that the last ball selected in this scenario will be red. This implies that we selected 6 white balls and 3 red balls in any manner before we selected the last red ball. So we need to find the probability of taking out 6 white balls and 3 red balls, and use permutation to account for the order they get drawn in:

Total Probability = Probability of 6 white balls * Probability of 3 red balls * number of ways this can happen

Probability of 6 white balls = 0.6 ^ 6

Probability of 3 red balls = 0.4 ^ 3

Number of ways this can happen (permutation with similar objects) = $\frac{9!}{6!*3!}$