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).

[Q]: Calculate prob of sequence pd when two letters picked without replacement from {d: 2, c: 1, m: 2, p: 2, z: 1}.
[A]: 1/14


[Q]: Suppose -3*n + 16 = -d, 0*n - 5*d = 3*n - 10. Let k = n + -3. Suppose 0 = k*g - g - 14. What is the greatest common factor of 28 and g?
[A]: 14


[Q]: Suppose 13 + 2 = 3*u. Suppose -4*b + 3 = -u. Solve b*z + 3 = z for z.
[A]:
-3