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Two DS questions I want to put up for discussion- 1) If d

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Two DS questions I want to put up for discussion- 1) If d [#permalink]

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New post 06 Jun 2009, 23:17
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Two DS questions I want to put up for discussion-
1)
If d denotes a decimal is d>=0.5
1)When d is rounded to the nearest tenth,the result is 0.5
2)When d is rounded to the nearest integer ,the result is 1.

2)If n is a positive integer and k =5.1*10^n then what is the value of k?
1)6000<k<500,000
2)k^2=2.601*10^9

I don't know the answers...but I have my own answers.... :)

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Re: Two DS questions for discussion [#permalink]

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New post 07 Jun 2009, 01:33
(1)

\(0.4<d<0.55 \longrightarrow\) YES or NO

(2)

\(d >= 0.5 \longrightarrow\) YES

Sufficient

\(B\).


#2

\(k =5.1*10^n\)

\(m | k\)
\(0 | 5.1\)
\(1 | 51\)
\(2 | 510\)
\(3 | 5,100\)
\(4 | 51,000\)
\(5 | 510,000\)

(1) Sufficient, only one value, 51,000

(2) Sufficient as although we have a quadratic, \(k^2\) implies +/- and k is positive so it only has one value

\(D\)
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Re: Two DS questions for discussion [#permalink]

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New post 07 Jun 2009, 08:17
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Yes,answers match mine with one very small exception-
you have written..
1)0.4<d<0.55 YES or NO
here i think the range will be
0.45<d<0.54
What do you think,,,,

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Re: Two DS questions for discussion [#permalink]

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New post 08 Jun 2009, 09:05
I agree 1) is B
For 2)
Qs => k^2=26.01*10^2n = 2.601*10^(2n+1)
1/ => k=4 (suf)
2/ => 2n+1=9 =>n=4 (suf )
IMO: D

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Re: Two DS questions for discussion   [#permalink] 08 Jun 2009, 09:05
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Two DS questions I want to put up for discussion- 1) If d

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