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).

Calculate prob of sequence pb when two letters picked without replacement from aapbbpppbpppbabab.
21/136

Let o be -12*-2*(-3)/(-24). What is the highest common factor of o and 33?
3

Let l be ((-7)/(-3) + 0)*6. Let h(g) = g**3 - 2*g**2 - 3*g + 1. Let s be h(4). Calculate the highest common factor of l and s.

7