1. Given two numbers, n and k ( 0< n, k <=12), generate all the pemutations taking k letters from n letters (nPk) considering first n small alphabets.
2. Use the idea of backtracking (recursion).

Well, this code would box the whole body of an html document. by using the relative value for position, you are telling it to position relative to its normal position, which the top left corner is at (0,0). by using left: 50px, you are telling the box to set the left margin  edge to 50px and by using top: 50px, you are telling it to set the top margin edge to 50px. by doing this shifting, the top left corner of the box, which is at (0,0) would be positioned at (50,50)

The best way she can do it is by doing the mentioned expirement but explaining it as a volcano eruption

One main difference is that a graphing calculator can graph out functions while a scientific calculator cannot. there are some scientific calculations that have built-in table functions, but generally (and obviously) scientific calculators are not built to be able to graph. graphing calculators have larger screens to accommodate for their eponymous use.furthermore, graphing calculators are usually more advanced. because of the specifications needed (like ram, processor) to be able to generate graphics, graphing calculators are able to support more sophisticated functions/features. some graphing calculators have a computer-algebra system, like the ti-89 titanium. some support spreadsheets. some even support programmable games. some allow for connectivity with a computer to install new programs.we have to consider another major difference: the price. graphing calculations are way more expensive than scientific calculators. i believe this has to do with the history behind graphing calculators. for example, texas instruments basically holds a monolopy over graphing calculators. school keep using tis because that is what they are familiar with.