How many ways can you rearrange the letters in Daniel?
There are 6 different letters. That means you have 6 choices for placing the first letter. Once you have placed that letter, you now have 5 choices for the second letter. So you have 6*5 = 30 options for the first two letters. Continuing this way, you have 6*5*4*3*2*1 = 720 ways to rearrange the 6 letters.