Section+4.3

Kindergartners problem here.

Another way to say this would be that there are 4 positions that the shapes can occupy. 4 choices for the first position, 3 choices for the second position, 2 choices for the third position, and one choice for the fourth position. Thus, there are 4! different arrangements, or 4x3x2x1, or 24 different ways.

A few Q and A's from 4.3 page 289

Q.How many different batting orders are possible for the nine payers of a baseball team? A. 72,576. Similar to the previous problem, there are 9 possible choices for the first spot, 8 possible choices for the second spot, and so on.
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Q. There are three towns in Wonderland: A, B, and C. There are six routes from A to B and three routes from B to C. No direct routes exist between A and C. How many ways are there to travel from A to C without backtracking? A. 18 ways. This is because 6x3=18
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Q. How many four-digit numbers are there? A. There are 9000 different possibilities. This is deduced by having 9 choices for the 1000s term, 10 choices for the 100s term, 10 choices for the 10s term, and finally, 10 choices for the 1s term.
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The other problems that were to be done in class were OYO 12,13,15,18,19 and 4.4 CYU 1-5.