Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.
--------
Question: Problem: if n is a positive integer and n ^ 2 is divisible by 36, then the largest positive integer that must divide n is
Options: a. 6, b. 12, c. 24, d. 36, e. 48

Answer: a


Question: Problem: 10, 1000, 100000, 10000000....
Options: a. 100, 000,000, b. 1,000, 000,000, c. 1, 000,000, 000,000, d. 100, e. 1, 000,000

Answer: b


Question: Problem: when the positive integer k is divided by the positive integer n, the remainder is 11. if k / n = 61.2, what is the value of n ?
Options: a. 9, b. 20, c. 65, d. 70, e. 81

Answer:
c