Answer: 220
Step-by-step explanation:
When we wanto to create a group of K elements for a set of N elements (where the order of the K elements does not matter, so we do not considerate the permutations of the K elements), the number of possible combinations is:

Here N = 12 and K = 3

So there are 220 possible combinations
The number 71 falls between the perfect squares of:
8 squared= 64 and 9 squared = 81
I dont believe you typed the whole equation, if you can clarify I might be able to help! but 3×27 = 81 if that's what you were looking for.
Hi. Your answer is 5,700 because 685 is closer to 700 than 600. Please ask if you have any more questions. Also please mark as the brainliest answer!