First you can choose from 26 letters, then from 25 (because you can't use the same letter) then from 24, and then from 23. You multiply 26 * 25 * 24 * 23 and you get your answer.
<span>1.Rename with common denominators. 2.Regroup the first fraction. 3.Subtract the whole numbers and numerators. <span>4.Simplify (if necessary)</span></span>
