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.
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Question: Question: If each of 4 digit code is formed of integers from 1 to 50, inclusively, and each of the digits are different, how many possible codes are there?

 Option A: 5527200

 Option B: 5586300

 Option C: 5598600

 Option D: 5547800

 Option E: 2569800

Answer: Option A


Question: Question: If 6 (A's capital) = 8 (B's capital) = 18 (C's capital). Then the ratio of their capitals is?

 Option A: 12:15:16

 Option B: 12:15:4

 Option C: 12:9:4

 Option D: 20:15:11

 Option E: 20:15:19

Answer: Option C


Question: Question: The variable x is inversely proportional to the square of the variable y. If y is divided by 6a, then x is multiplied by which of the following?

 Option A: 1/36a

 Option B: 1/36a^2

 Option C: 1/6a

 Option D: 36a

 Option E: 36a^2

Answer:
Option E