Mathematics: Deshawn has five cds that he is going to give away. he lets his best friend choose three of five cds. how many different groups of three cds are possible?

Deshawn has five cds that he is going to give away.

nashaflores17

06.01.2022

10 different groups of three CDs are possible

Step-by-step explanation:

Total CDs are five and 3 has to be chosen where order doesn't matter.

In these kind of scenarios, combinations are used for calculating different ways in which the CDs can be given.

So,

Number of ways in which groups of CDs are possible = ⁵C₃

$= \frac{n!}{r!(n-r)!} \\= \frac{5!}{3!(5-3)!}\\=\frac{5!}{3!2!}\\=\frac{5*4*3!}{3!2!}\\=\frac{5*4}{2}\\=\frac{20}{2}\\=10$

Therefore, 10 different groups of three CDs are possible ..

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lizdominguez101

27.12.2022

x = -1, 2

Step-by-step explanation:

√3x+3 - 1 = x

√3x + 3 = x + 1

3x + 3 = x^2 + 2x + 1

x^2 - x - 2

( x - 2 )( x + 1 )

x = -1, 2

Hopefully this helps!

Brainliest please?

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