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: Two letters picked without replacement from {x: 8, p: 5, a: 7}. Give prob of sequence xa.

A: 14/95
****
Q: Calculate prob of sequence ee when two letters picked without replacement from {p: 5, e: 3}.

A: 3/28
****
Q: Let n be 12/4 + (-13)/1. What is the units digit of 5/(n/(-6)) + 4?

A:
7
****