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thailandvc
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estimation problem 13 Jan 2010, 01:50
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1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9

got this recently on a practice test. anybody know how to do this? (unfortunately i don't remember the solution. if anyone who took PR's free online practice test remembers, please feel free to add answ choices.)



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estimation problem 13 Jan 2010, 03:12
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The sum of 1/2, 1/3 and 1/6 is 1
The sum of 1/4 and 1/5 is .45
The value of 1/8 is .125
Sum of 1/7 and 1/9 would nearly 2 times 1/8 that is .2 5

So the sum should be around 1.825
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thailandvc
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estimation problem 13 Jan 2010, 04:34
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sorry cut and paste error: its supposed to be.

1/12+1/13+1/14+1/15+1/16+1/17+1/18 +1/19= ?
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jade3
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estimation problem 13 Jan 2010, 09:12
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We know that 1/12= .08; whereas 1/19 should be near to .05

We also know that slope of the graph of 1/x falls between 10 and 20 much faster at initial values than at latter values

So, we can estimate the value of 1/12+1/13+1/14+1/15+1/16+1/17+1/18+1/19
to be near to (.08*2+.05*6)/8=.05
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thailandvc
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estimation problem 13 Jan 2010, 09:19
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thanks. i remember now; the answer choices were above 1/2, 1/2, below 1/2, and two other choices. i was struggling between A and B.
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janani
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estimation problem 13 Jan 2010, 10:27
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could you please post all the choices as well ?

i know how to solve but am just curious what the choices (traps) are
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estimation problem 24 Dec 2010, 05:19
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Can someone please suggest a reasonable solution to this one?



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Hi there,
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