Suppose we toss balls into N bins until some bin contains two balls. Each toss is independent, and each ball is equally likely to end up in any bin. What is the expected number of ball tosses?

your question is incomplete, write all the numbers in the sequence that it tells you.  

step-by-step explanation:

twenty-six miles over two gallons because the proportion for the original 13 miles to one gallon would be written 13/1 and, doing the same thing to the top and bottom, i multiplied by 2 and got 26/2

hello,

as   long as they add up to 180 its correct.