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Adding Fractions [#permalink] New post 28 Nov 2005, 09:33
Just a question about adding a sequence of fractions. If a question asks to approximate the value of 1/10+1/11+1/12+/13...+1/30, what is the best way to attack it?

Thx.
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Re: Adding Fractions [#permalink] New post 28 Nov 2005, 17:35
desiguy wrote:
Just a question about adding a sequence of fractions. If a question asks to approximate the value of 1/10+1/11+1/12+/13...+1/30, what is the best way to attack it?

Thx.


The sum is greater than (30/30) and smaller than (30/10).
I guess this is the only meaningful information we can quickly derive from the question.
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 [#permalink] New post 28 Nov 2005, 18:34
Any number 1/11, 1/12, 1/13... etc is going to be smaller than 1/10. The sum should be close to 1/10 multiplied 30 times. Look at the 5 choices and pick the closest. The sum should be smaller than 30/10 though...
  [#permalink] 28 Nov 2005, 18:34
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