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 Answers to Lesson 1:

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Dojo
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PostSubject: Answers to Lesson 1:   Fri Aug 15, 2008 6:43 pm

1
a) 2~20 is the same as 1~19, therefore the answer is 19
b) 7~16 is the same as 1~10, therefore the answer is 10
c) 4~13 is the same as 1~10, therefore the answer is 10

2 Let us divide all the numbers in the set by 3:
1,2,3...14
Therefore the answer is 14.

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herefishyfishy1
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PostSubject: Re: Answers to Lesson 1:   Sun Aug 17, 2008 4:27 pm

You can also use the handy-dandy formula.
If A is an arithmetic sequence, then

n=(An-A1)/r+1

(Wow, the subscripts work!)
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