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alisha [4.7K]
3 years ago
11

How many ordered lists are there of two items chosen from three?

Mathematics
1 answer:
LUCKY_DIMON [66]3 years ago
7 0
To answer this item, we are to use the concept of combination. The equation is as follows,

    nCr = (n!)/((r!)(n - r))!

Substituting the known values in the equation,
 
   3C2 = 3!/(2!)(3-2)! = 3

Hence, the answer to this item is 3. 

<em>ANSWER: 3</em>
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Whether you're teaching the meaning of fractions or fraction operations, visual models can help students connect fractions to what they already know. Division is an essential foundation for fractions. Once students can divide objects into equal groups, they can begin to grasp dividing a whole into equal parts.

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Y_Kistochka [10]

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Step-by-step explanation:

4 0
3 years ago
I need some help with this rational equation. It's supposed to = -1, but for some strange reason I keep getting x^2 +2x = -1.
Rasek [7]

This one is so easy that your brain refuses to accept it.
It's looking for a harder answer, but can't find it !

You're totally correct, as far you went.     x² + 2x does = -1

Now add ' 1 ' to each side:     x² + 2x + 1 = 0

Can you factor that quadratic ?
Can you mash it through the quadratic formula ?

Actually, it's the simplest possible perfect square.

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So the solutions of     x² + 2x + 1 = 0  are both   x = -1 .

Don't say anything.
I know it's embarrassing.

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