Microsoft's Minecraft Set to Launch its Own Currency. by. Microsoft Corp. is adding a new marketplace -- and a brand new currency -- within the video-game Minecraft, opening up the opportunity for businesses to sell their original content and creations to tens of millions of the gameâs players for the first time.
In combinatorics, the rule of sum or addition principle is a basic counting principle. Stated simply, it is the idea that if we have a ways of doing something and b ways of doing another thing and we can not do both at the same time, then there are a + b ways to choose one of the actions.
It is also called the Commutative Property of Addition because it allows the order of the addends to be changed without affecting the sum. So, 3 + 5 has the same sum as 5 + 3. Subtraction, however, is not commutative. When the order of the numbers in a subtraction problem are changed, the answer is different. For example 8 â 5 is not the same difference as 5 - 8. Encourage children to use the Commutative Property to make addition easier.