instruction:
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.
question:
Question: Given that there are 6 basketball players per team, how many ways can you select 2 basketball players from 3 teams if no more than one player can be selected from each team?

 Option A:  15

 Option B:  30

 Option C:  60

 Option D:  108

 Option E:  90
answer:
Option D


question:
Question: What is the units digit of 18! + 5 ?

 Option A: 2

 Option B: 3

 Option C: 4

 Option D: 5

 Option E: 6
answer:
Option D


question:
Question: There are r red marbles, b blue marbles and w white marbles in a bag. Write the ratio of the number of blue marbles to the total number of marbles in terms of r, b and w.

 Option A: r/ (r + b + w

 Option B: b/ (r + b + w

 Option C: w / (r + b + w

 Option D: r / (r + b 

 Option E: r / ( b + w
answer:

Option A