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 W is an integer greater than 6, which of the following must be divisible by 3?

 Option A: W(W+1

 Option B: N(N+2

 Option C: N(N+3

 Option D: N(N+4

 Option E: N(N+5

Answer: Option A


Question: Question: A seller of used cars has 18 cars to sell and each of his clients selected 3 cars that he liked most. If each car was selected exactly thrice, how many clients visited the garage?

 Option A: 8

 Option B: 10

 Option C: 12

 Option D: 18

 Option E: 16

Answer: Option D


Question: Question: Out of first 20 natural numbers, one number is selected at random. The probability that it is either an even number or a prime number is?

 Option A: 17/25

 Option B: 17/24

 Option C: 17/29

 Option D: 17/20

 Option E: 17/21

Answer:
Option D