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please help ...OA needed urgently

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Junior | Next Rank: 30 Posts
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by jeegarm » Wed Oct 08, 2008 9:40 pm
For all integers n
n* = n(n-1) WHat is the value of x*
1>x* = x(x-1)
2>(x-1)* = x-2
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Source: — Data Sufficiency |
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by gmat009 » Wed Oct 08, 2008 9:43 pm
IMO B
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by Gmatss » Thu Oct 09, 2008 8:51 am
IMO B

Stament one just repeats it self and values of x will vary

Statement 2 says (x-1)*=x-2
which implies (x-1)*= (x-1)((x-1)-1) =>
(X-1)(x-2)=(x-2)=> x^2-3x+2=x-2 and from here it's just solving quad equations. so hence B answer should be x=2
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by mental » Thu Oct 09, 2008 9:08 am
Gmatss

no need to go quadratic
(X-1)(x-2)=(x-2)=>
(x-1)(x-2) - (x-2) = 0
take (x-2) common => (x-2)[(x-1) - 1] = 0 =>
(x-2)(x-2) = 0

well its just another - slightly different way :wink:
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by sumiwali » Fri Oct 10, 2008 2:29 am
i think answer should be C as first equations tells us that x is an integer, else we cannot assume the same for statement 2.

whats the OA??
Lets Beat 'IT'!!!!!!!
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by sumiwali » Fri Oct 10, 2008 2:30 am
i think answer should be C as first equations tells us that x is an integer, else we cannot assume the same for statement 2.

whats the OA??
Lets Beat 'IT'!!!!!!!
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by raju232007 » Fri Oct 10, 2008 2:57 am
n*=n(n-1) .......Given

statement 1:

x*=x(x-1)
x(x-1)=x(x-1)
x can have number of values and hence this statement is insufficient

statement 2:
(x-1)*=(x-2)
(x-1)(x-2)=(x-2) ( applying the formula given in the question stem)
x-1=1
x=2
2*=2(2-1)=2
Statement 2 is sufficient

Hence the OA should be B....
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