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 aanoaooonoaoa. What is prob of sequence nna?
[EX A]: 5/858

[EX Q]: ((-510)/72)/(-17)*22/11
[EX A]: 5/6

[EX Q]: Let a(h) be the third derivative of h**6/120 - h**5/15 + h**4/24 - h**3/3 + 4*h**2. Let z be a(4). Solve 2*o = z*n - 8, 0*o - 4 = -2*n - 2*o for n.
[EX A]:
3