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).

Calculate prob of sequence ggt when three letters picked without replacement from {t: 12, g: 6}.
5/68

What is prob of sequence cw when two letters picked without replacement from rcrwwwrrsrsrrs?
3/182

Four letters picked without replacement from {k: 2, m: 16}. Give prob of picking 4 m.

91/153