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Chapter 3

Posted by giggs 
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Chapter 3
March 26, 2007 09:53AM
Help with rule 2:
The defination state:
Rule 1: 2 is EVEN
Rule 2: if x is EVEN, then so is x+2
Rule 3: The.... from two rules above.

What i dont get is Rule 2. Is it always that to use rule 2, i must have x(a certain number) + 2 only or even if i have:
e.g

2 + 2 = 4 (EVEN) ...Rule 2
4 + 2 = 6 (EVEN) ......Rule 2
6 + 4 = 10 (EVEN)? is this still Rule 2?
avatar Re: Chapter 3
March 26, 2007 11:06AM
No, it does not comply with the Rule. Further in the chapter there is another definition of EVEN, where Rule 2 states : "If x and y are both in EVEN, then so is x + y", When using this definition 4 + 6 would be correct.

smile
Re: Chapter 3
March 26, 2007 11:11AM
So, how many ways are there for me to get to 20 for example, using RULE 2 that is?
avatar Re: Chapter 3
March 26, 2007 11:28AM
If I remember correctly, the question stated specifically to use the definition on a certain page. That was the first definition with the x = even, then x + 2 = even. The example that Elize is quoting, was not on the same page and I ignored that version of Rule 2.
Reanie
avatar Re: Chapter 3
March 26, 2007 11:31AM
There is just one way that is x+2, but there will be 9 applications of the rule to get to 20

1) 2 + 2 = 4
2) 4 + 2 = 6
3) 6 + 2 = 8
4) 8 + 2 = 10
5) 10 + 2 = 12
6) 12 + 2 = 14
7) 14 + 2 = 16
8) 16 + 2 = 18
9) 18 + 2 = 20
Re: Chapter 3
March 27, 2007 01:21PM
Oh! i get it now, the are two methods, page 21 and page 22, thanks guys
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