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.

[Q]: Problem: 2,7, 17,3, 11,19, 5,13, __
Options: a. 20, b. 21, c. 22, d. 23, e. 24
[A]: d


[Q]: Problem: an error 1 % in excess is made while measuring the side of a square. the percentage of error in the calculated area of the square is :
Options: a. 2.01, b. 30.1, c. 3.01, d. 25.01, e. 4.05
[A]: a


[Q]: Problem: if 0.2 of a number is equal to 0.08 of another number, the ratio of the numbers i
Options: a. 2: 3, b. 2: 5, c. 3: 20, d. 20: 3, e. none
[A]:
b