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easy question NO2 from disclosure

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magical cook Master | Next Rank: 500 Posts Default Avatar
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easy question NO2 from disclosure

Post Tue Sep 26, 2006 7:34 am
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    Could anyone please give me some example to understand this question?? I am confused..

    Which of the following procedures is alwasys equivalent to adding 5 numbers and then deviding the sum by 5?

    I. Multiplying the 5 numbers and then finding the 5th root of the product.

    II. Adding the 5 numbers, doubling the sum, and then moving the decimal point one place to the left.

    III. Ordering the 5 numbers numerically and then selecting the middle number.


    A) None
    B) I only
    C) II only
    D) III only
    E) I and III


    The answer is C

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    cooldude Master | Next Rank: 500 Posts Default Avatar
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    Post Tue Sep 26, 2006 8:41 am
    method 1 - suppose we have numbers 4 8 9 27 1;so fifth root of product is 6

    but adding them all then divide by 5 is not equal to 6

    method 2-suppose a b c d e are any 5 inteers so sum is a+ b+ c+ d +e
    and doubling it is 2(a+ b+ c+ d +e) the divide by 10 is {a+ b+ c+ d +e}/5

    method 3-
    again take 4 8 9 27 1 so middle no. is 8


    hence u c only second is correct

    magical cook Master | Next Rank: 500 Posts Default Avatar
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    Post Tue Sep 26, 2006 7:45 pm
    Thank you so much for your help.

    it becomes very clear but one part... (sorry very basic)

    as for the method 1
    the product of the example 5 numbers: 4 8 9 27 1 will be 7776, and how come 5th root of 7776 is 6??

    Thank you...

    cooldude Master | Next Rank: 500 Posts Default Avatar
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    Post Tue Sep 26, 2006 9:04 pm
    break them into factors and make sets of 5 !!!!!!!

    there r 5 2s and 5 3s

    magical cook Master | Next Rank: 500 Posts Default Avatar
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    Post Tue Sep 26, 2006 9:23 pm
    Thank you again Cooddue...

    I thought 5th root of product is like this (see attached), but actually that means "make 5 sets of factors"

    Yes, there are 22222 and 33333.

    Thank you!
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