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please help ...OA needed urgently
Source: Beat The GMAT — Data Sufficiency |
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
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
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
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
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??
whats the OA??
Lets Beat 'IT'!!!!!!!
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??
whats the OA??
Lets Beat 'IT'!!!!!!!
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....
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....
