For your birthday you recieved a gift certificate from a music store for three cds. there eight you would like to have. if you select the cds at random, how many different groups of cds could you select

56

Step-by-step explanation:

First, do you know what a CD is? ;-)

Since you will pick 3 CDs out of 8, and the order of the CDs don't import (1,2,4 is the same as 2,1,4 and 4,2,1 for example),we'll calculate the Combinations (and not the permutations). The formula for Combinations is:

Where n is the number of elements (8 in our case) an n is the sample (3 in our case).

So, there are 56 random groups of 3 you can pick from your potential 8 CDs.

0.0076, if you meant 4.125 divided by 0.03125 it would be 132

step-by-step explanation:

first you have to move the decimal in 0.03125 over until its behind the 5 which is 5 places over. now the number is 3125

then you have to move the decimal in 4.125, 5 places over. now the number is 4,112,500.

now you divide like you would normally would and get 0.0076