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.

[EX Q]: Question: On flipping 3 coins together what is the outcomes for at least four tail?

 Option A: 1/7

 Option B: 0

 Option C: 1

 Option D: 4/13

 Option E: 5/13
[EX A]: Option B

[EX Q]: Question: If x and y are integers, what is the least positive number of 24x+18y?

 Option A: 3

 Option B: 6

 Option C: 9

 Option D: 12

 Option E: 15
[EX A]: Option B

[EX Q]: Question: You buy a piece of land with an area of âˆš1024, how long is one side of the land plot?

 Option A: 28

 Option B: 29

 Option C: 30

 Option D: 31

 Option E: 32
[EX A]:
Option E