Given a simple high-school level math question, you are required to solve it and provide the final answer. The final answer is always a single number. These questions can range from a variety of topics like simple arithmetic, solving equations, converting a quantity from one unit to another, finding remainders/GCD/LCM, finding probabilities etc. Each question has only one correct answer. This answer can be a positive or negative integer, a fraction or a decimal number. If the answer is a negative number use the hyphen (e.g. -42) symbol for the minus sign. For decimal numbers, do not add extra zeros after the decimal point. For fractional numbers, separate the numerator and denominator using a forward slash (e.g. 3/25).

[EX Q]: Three letters picked without replacement from oxccztxcccocottcxxto. Give prob of picking 2 o and 1 t.
[EX A]: 2/95

[EX Q]: Two letters picked without replacement from dhxhhdhufehhfdexhe. What is prob of sequence xd?
[EX A]: 1/51

[EX Q]: Let u(o) = -o**3 + 6*o**2 - 6*o + 6. Suppose -12 = -0*r - 4*r + 2*f, 0 = -4*f. What is the remainder when r is divided by u(5)?
[EX A]:
0