For any number n, (n) is 10 multiplied by the largest : DS Archive
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# For any number n, (n) is 10 multiplied by the largest

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For any number n, (n) is 10 multiplied by the largest [#permalink]

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27 Sep 2006, 01:47
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For any number n, â‚¬(n) is 10 multiplied by the largest integer that is smaller than (n+5)/10.
If a,b and c are positive integers, is â‚¬(a+b+c)> â‚¬(a)+â‚¬(b)+â‚¬(c)?

(1) 1<a<b<c
(2) abc=154

Last edited by kevincan on 27 Sep 2006, 03:47, edited 1 time in total.
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27 Sep 2006, 02:02
Should be B
abc=154 implies (a,b,c)=2, 7, 11
Putting in the values in the equation gives
E(a+b+c)=E(a)+E(b)+E(c)=20 so B is sufficient.

A could give different answers depending on numbers chosen.[/list]
27 Sep 2006, 02:02
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