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]: What is prob of picking 3 h and 1 t when four letters picked without replacement from {h: 6, n: 4, t: 5}?
[A]: 20/273


[Q]: What is (-3)/(-12) - (4 + (-76)/16)?
[A]: 1


[Q]: What is prob of picking 1 e and 1 d when two letters picked without replacement from {y: 2, j: 1, b: 1, c: 1, e: 1, d: 1}?
[A]:
1/21