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).

Suppose -u = -7 + 1. What is the remainder when 17 is divided by u?
5

How many micrometers are there in 7/8 of a millimeter?
875

Three letters picked without replacement from {k: 3, x: 6, c: 2, e: 4, z: 1}. What is prob of picking 1 e, 1 k, and 1 c?

3/70