Probability in monopoly 
Based off of this classical monopoly board, my friend told me that it is better statistically to get 3 properties because you are more likely to land on the properties because they are close together. Because the properties are close together, it means that the probability of you landing on them is higher.
What I said is statistically it is better to get the railroads because there are 4 railroads on the board.
So the probability of landing on a railroad every time going around the board is 4 / 40 which is a 10% chance.
And the probability of landing on the 3 properties right next to eachother is 3 / 40 which is a 7.5% chance.
There are other factors involved like you have to roll 2 dice. This means 6 7 8 are the most common dice rolls, with 7 being the most popular.
What I want to know is, statistically through the course of a game where you might go around the board 20 - 30 times, is it more likely for you to land on the railroads or land on 3 properties (such as orange or red).

In addition to what others have said, by creating a Markov chain, one can find the exact probabilities of each space on the board. Due to chance/community chest cards and, of course, the "Go To Jail" space, the probability of each space differs. 
Since Jail is so commonly visited, the properties next to it -- orange and red, especially -- are visited a lot. In addition, spaces which cannot be landed on through chance/comm chest cards (such as chance and comm chest themselves) are visited significantly less. Chance 3 has around a $1\%$ chance to be landed on.
