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

 Option A: 2

 Option B: 3

 Option C: 4

 Option D: 5

 Option E: 6

SOLUTION: Option D

PROBLEM: Question: A lady bought five books namely A,B,C,D,E to distribute her 7 friends. How many ways she can distribute books?

 Option A: 7^3

 Option B: 7^4

 Option C: 7^5

 Option D: 7^6

 Option E: 7^2

SOLUTION: Option C

PROBLEM: Question: What is the probability of getting a sum 9 from two throws of a dice?

 Option A: 1/5

 Option B: 1/9

 Option C: 1/7

 Option D: 1/12

 Option E: 1/6

SOLUTION:
Option B