Suppose we roll a die repeatedly until we see each number at least once and let r be the number of rolls required. find the mean and variance of r.
the answers in the back of the book are mean= 14.7 rolls and variance is 38.99

d? maybe

step-by-step explanation:

answer: yes i agree that you should not put it on/p>

step-by-step explanation: the reason for this is that it wastes other peoples time and also make them fail as well and that is never good.

the simplified form is

step-by-step explanation:

we want to simplify the expression,

let us change the middle bar to a normal division sign to obtain,

we multiply the first fraction by the reciprocal of the second fraction to obtain,

we factor to obtain,

we cancel the common factors to get,

we simplify to get,

the correct answer is b