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).

Ex Input:
Four letters picked without replacement from nknkknk. What is prob of picking 2 k and 2 n?

Ex Output:
18/35


Ex Input:
What is prob of sequence yyz when three letters picked without replacement from {y: 13, z: 1, a: 3, q: 2}?

Ex Output:
26/969


Ex Input:
What is prob of picking 1 c and 1 k when two letters picked without replacement from fkfcfkfpfgcpg?

Ex Output:

2/39