TASK DEFINITION: You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.
PROBLEM: Question: Which of the following CANNOT be weighed using a balance scale and these unit weights: 1, 4, 7, and 10

Option A: 13

Option B: 15

Option C: 17

Option D: 19

Option E: 21

SOLUTION: Option A

PROBLEM: Question: If N = 2^0.1 and N^b = 16, b must equal

Option A: 3/80

Option B: 3/5

Option C: 40

Option D: 5/3

Option E: 80/3

SOLUTION: Option C

PROBLEM: Question: A octagon marked 1, 2, 3, 4, 5,6,7 and 8 on its eight sides. four colors, pink, yellow,green and blue are used to paint the eight sides of the octagon. If the adjacent faces are painted with the different colors, in how many ways can the octagon be painted?

Option A: 6

Option B: 4

Option C: 27

Option D: 12

Option E: 8

SOLUTION:
Option E