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: Two letters picked without replacement from jbbfbbbfffo. What is prob of sequence jf?

Answer: 2/55


Question: Two letters picked without replacement from naioiaaiaaaia. Give prob of picking 1 n and 1 i.

Answer: 2/39


Question: What is prob of picking 3 u when three letters picked without replacement from xuuxxuc?

Answer:
1/35