Nine children are to be divided into an A team, a B team and a C team of 3 each. The A team will play in one league, the B team in another, the C team in a third league. How many different divisions are possible

The answer is "840".

Step-by-step explanation:

Following are the number of ways in which selecting a team A  by 9 children:

Following are the number of ways in which selecting a team B  by remaining 6 children:

Following are the number of ways in which selecting a team C  by remaining 3 children:

Following are the number of ways in which making 3 teams by 9 children:

(Note: we've split by 3! Because it also is necessary to implement three teams between themselves)

Now 3 leagues have to be played. One is going to be run by each team.

That is the way it is

Different possible divisions

a) what number, when added to negative four, is equal to negative five?

step-by-step explanation:

a

step-by-step explanation: