Hi,
I am basically student of applied Economics but as a toll of research we use statistics. We are just in the beginning of the things and I have a problem. I get confused in questions related to permutation and combination and find it difficult to figure it out about what formula to use. Is there any trick that can make things easier for me? Please do reply

Use permutations when order matters but use combinations when order does not matter.

Permutations and combinations refers to the many ways different variables can be combined to create an out come. A very, very simple explanation. If you flip a coin you have a 1:2 chance of heads. If you flip it again, the odds are still 1:. However if you what to know what the chances are or fliping two heads ina row with two flips, its 1:4. I used this simple model because you were talking about statistics. How many different ways can you combine the variables. Help?