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]: Divide -1830 by -6.
[A]: 305


[Q]: Four letters picked without replacement from {e: 8, m: 2}. Give prob of sequence emme.
[A]: 1/45


[Q]: Four letters picked without replacement from {p: 1, e: 18}. What is prob of picking 2 p and 2 e?
[A]:
0