Question

A box contains 13 green marbles and 13 white marbles. If the first marble chosen was a white marble, what is the probability of choosing, without replacement, another white marble? Express your answer as a fraction or a decimal number rounded to four decimal places.

Answer 1

$\textbf{Answer:\ \ \large\boxed{\frac{12}{25} }\ or\ 0.4800}$

Step-by-step explanation:

$\large\boxed{13\ green\ marbles\ and\ 13\ white\ marbles}$

After a white marble is chosen:

$\large\boxed{13\ green\ marbles\ and\ 12\ white\ marbles}$

Now there are 25 (13 + 12) total marbles.

Without replacing the white marble we chose already, what is the probability of choosing another white marble?

Well, now there are 12 white marbles to choose from, out of a total of 25 marbles. This means our probability is:

$\large\boxed{\frac{12}{25} }$

This in decimal form is:

0.4800