It's a probability equation. The probability of getting an orange sweet the first time is 6/n. The probability of getting an orange sweet the second time is 5/n-1Times those together to get the probability of 2 orange sweets: 6/n x 5/n-1 = 30/n2 - n This we're told equals a 1/3: 1/3 = 30/n2 - n (then times the bottoms up)n2 - n = 90 (take the 90 over to the left)n2 - n - 90 = 0