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]: 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 {t: 6, e: 2}. What is prob of picking 4 t?
[A]: 3/14


[Q]: Let n = 17 - 12. Suppose -4*t + h = 48, -h + 24 = -n*t - 37. Let b = t + 21. What is the units digit of b?
[A]:
8