You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
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.

From a pack of 52 cards, two cards are drawn together at random. What is the probability of both the cards being kings? 

 Option A:2/1223 

 Option B: 1/122 

 Option C: 1/221 

 Option D: 3/1253 

 Option E: 2/153 


Solution: Option C
Why? Let s be the sample space. 
 Then n(s) = 52C2 = 1326 
 E = event of getting 2 kings out of 4 
 n(E) = 4C2 = 6 
 P(E) = 6/1326 = 1/221

New input: Question: If Q:R = 6:7 and R:S = 8:9 then Q:R:S is

 Option A: 48:56:68

 Option B: 48:56:66

 Option C: 48:56:63

 Option D: 44:52:63

 Option E: 48:50:63
Solution:
Option C