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tensa zangetsu [6.8K]
3 years ago
5

When you toss a die while playing a game, you can get 1, 2, 3, 4, 5, or 6 on the top face. How many possible combinations of the

top faces for the dice are there if:
a) you must toss 4 dice

b) you must toss n dice
Mathematics
1 answer:
Igoryamba3 years ago
4 0

Using the fundamental counting theorem, it is found that:

a) 1296 combinations are possible.

b) 6^n combinations are possible.

The <u>fundamental counting theorem</u> states that for n independents trials, each with n_1, n_2, n_n ways of being done, the total number of combinations is:

T = n_1 \times n_2 \times ... \times n_n

Item a:

Four independent dice throws, each with six outcomes, thus:

T = 6 \times 6 \times 6 \times 6 = 6^4 = 1296

Item b:

n independent dice throws, each with six outcomes, thus:

T = 6^n

A similar problem is given at brainly.com/question/24067651

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A bridge in the shape of an arch connects two cities separated by a river. The two ends of the bridge are located at (–7, –13) a
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Answer:

y=-\dfrac{13}{49}x^2

Step-by-step explanation:

The shape of an arch corresponds to a parabola.

the general equation for a parabola is:

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so we can plug these values in the general equation to make 3 separate equations:

(x,y) = (-7,-13)

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49a+7b+c=-13

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so we have three equations. and we can solve them simultaneously to find the values of a,b, and c.

we've already found c = 0, let's use substitute it to other equations.

49a-7b+c=-13\quad\Rightarrow\quad49a-7b=-13

49a+7b+c=-13\quad\Rightarrow\quad49a+7b=-13

we can solve these two equation using the elimination method, by simply adding the two equations

\quad\quad49a-7b=-13\\+\quad49a+7b=-13

------------------------------

\quad\quad 98a=-26

\quad\quad a=-\dfrac{13}{49}

Now we can plug this value of a in any of the two equations.

49a-7b=-13

49\left(-\dfrac{13}{49}\right)-7b=-13

-13-7b=-13

-7b=0

b=0

We have the values of a,b, and c. We can plug them in the general equation to find the equation of the arch.

y=\left(-\dfrac{13}{49}\right)x^2+0x+0

y=-\dfrac{13}{49}x^2

49y=-13x^2

This our equation of the arch!

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