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3 years ago

7

(c) Danny also pulls two cards and says that his SUM is ZERO. What pairs of cards could Danny have pulled? List all correct answ

ers and explain why or show your work. the cards are 1 2 3 4 5
-1 -2 -3 -4 -5

1 answer:

agasfer [191]3 years ago

5 0

-1 and 1

-2 and 2

-3 and 3

-4 and 4

-5 and 5

because when u subtract the numbers or add you will get 0

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lorasvet [3.4K]

Answer:

7/20

Explanation:

The theoretical probability, P (A), of an event, A, is:

P(A) = number of outcomes of event A / total number of possible outcomes

For 10 cranberry and 15 strawberry juices, the number of outcomes for two strawberry juices are:

Combination of 15 strawberry juices chosen in two:

$C^{15}_{2}=\frac{15!}{(15-2)!(2!)}=\frac{15!}{13!2!}=\frac{15\times 14}{2}=105$

The total number of possible outcomes is:

Combination of 25 juices chosen in two:

$C^{25}_{2}=\frac{25!}{(25-2)!(2!)}=\frac{25!}{23!2!}=\frac{25\times 24}{2}=300$

Thus, the probability of randomly picking two strawberry juices is:

P (two strawberry juices) = 105/300 = 7/20

Note that you can obtain it as the product of the probabilities that the first juice is a strawberry juice and the second juice is also strawberry juice:

$15/25\times 14/24=(15\times 25)/(14\times 24)=210/600=7/20$

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3 years ago

NEED HELP ASAP!!!!Instructions: Using the following image, solve for the trigonometry ratios of

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Answer:

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Solve this please .......

nikdorinn [45]

Answer:

The sum of reciprocals is 2/3.

You don't need complex numbers to solve this, but if you try to find a and b you will need complex numbers.

Step-by-step explanation:

a+b = 2

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(a*b)*(1/a + 1/b) = (a*b)x

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let's solve the quadratic equation

a^2 - 2a + 3 = a^2 - 2a + 1 + 2 = (a - 1)^2 + 2 = 0

(a - 1)^2 = -2

$a_1 - 1 = \sqrt{2}i\\a_1 = 1+\sqrt{2}i\\\\a_2 - 1 = -\sqrt{2}i\\a_2 = 1 - \sqrt{2}i\\$

these options correspond to a and b from the original question.

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2 years ago

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Không thảo mãn vì

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