Would anyone mind explaining the calculation of combinations process to me?

A (Although I'm unable to solve it, it seems simple enough) basic question serves as an example follows: A class is drawing maps of the 7 continents to display in the school lobby.

The main wall in the lobby has room for 3 maps. How many combinations of maps are possible for that location?

30 combinations
21 combinations
35 combinations
10 combinations

I don't really need an answer to the aforementioned question, but I thought it'd be nice to have an example.

Question

Would anyone mind explaining the calculation of combinations process to me?

A (Although I'm unable to solve it, it seems simple enough) basic question serves as an example follows: A class is drawing maps of the 7 continents to display in the school lobby.

The main wall in the lobby has room for 3 maps. How many combinations of maps are possible for that location?
 		
	30 combinations
	21 combinations
	35 combinations
	10 combinations

I don't really need an answer to the aforementioned question, but I thought it'd be nice to have an example.

thereisnousername · Answer

try this website, https://www.easycalculation.com/statistics/learn-permutation-combination.php

thereisnousername · Answer

oh I think you may just have to multiply 7 by 3 because its 7 continents per map, but I may be wrong I'm not quite sure

ddos_dragon · Answer

I hope it's that simple.

I shall heed your advice, though.

thereisnousername · Answer

let me know what happens!

ddos_dragon · Answer

Actually, I'll go with a 35.