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Choosing at least one even number when selecting 2 cards from the bag

Sagot :

Using the combination formula, it is found that there is a 0.7778 = 77.78% probability of choosing at least one even number.

What is the combination formula?

[tex]C_{n,x}[/tex] is the number of different combinations of x objects from a set of n elements, given by:

[tex]C_{n,x} = \frac{n!}{x!(n-x)!}[/tex]

In this problem, there are 10 numbers numbered from 1 to 10.

The total number of outcomes is given by:

[tex]T = C_{10,2} = \frac{10!}{2!8!} = 45[/tex]

The number of outcomes with only odd numbers is given by:

[tex]O = C_{5,2} = \frac{5!}{2!3!} = 10[/tex]

Hence 45 - 10 = 35 outcomes have at least one even number, so the probability is:

p = 35/45 = 0.7778.

More can be learned about the combination formula at https://brainly.com/question/25821700

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