instruction:
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).
question:
What is prob of picking 3 h and 1 t when four letters picked without replacement from {h: 6, n: 4, t: 5}?
answer:
20/273


question:
What comes next: -18, -32, -60, -108, -182, -288, -432, -620?
answer:
-858


question:
What is next in -3286, -3288, -3290, -3292, -3294, -3296?
answer:

-3298