Sometimes you wonder why they bother to teach you the formula for counting combination and permutation when most of the problems can’t be solved by any of them anyway. My advise when studying counting arrangements problem? Understand the multiplication principle, as in really understand it, before you get used to formulas. The Multiplication Principle. If
The following photo is going viral in Facebook with 848, 039 likes as of this writing. I checked out the latest 200 comments/answers and I got the following: 20, 320, 306, 128, 116, 34, 128, 160, including “depends on the value of x“. But there should only be one answer otherwise, what’s the use of
Here are three methods of multiplying binomials. Method 1 is known as the long method of multiplication. It’s the same procedure you did with numbers in primary school. It works with multiplying any two polynomials. Method 2 looks efficient but it only works for multiplying binomials. It’s also called the FOIL method for multiplying binomials.