Counting Problems

This video explains how to determine the number of ways an event can occur. It uses the counting principle and combinations.

[chiel]

for the example at 8:55 could one say that this is also possible to be written as 2x6!=1440. Is this the same or is this a coincidence?

[danielsama]

for the first problem why do we do have to multiply, and for the third problem why do we have to add the different combinations?

[KASTR]

Great videos, helpful. So much for my little brain

[damndanielz]

For the last question part 2, aren't there more ways to arrange the 2 boys? e.g 1 boy at the beginning and the other one at the end?

[subarnaahmed]

In the first problem, in first box we can't put 0 so there must be 39x40x40

Isn't it?