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As per one of the previous posts. I dont understand why we cannot divide each side by x in statement 1. Can anyone please explain this? i divided both sides by x in statement 1 and got x =2 my answer was D. Madhan: division by an unknown X may end up with a division by 0 (zero), which is undefined.

by rid

Mon Feb 28, 2011 10:30 am
Forum: Data Sufficiency
Topic: What is the value of x*?
Replies: 29
Views: 13540

(1) Insufficient
x=x(x-1) => x = 0 and/or x = 2

(2) Sufficient
(x-1)(x-2)=(x-2) => (x-2)(x-2)=0, x=2

by rid

Mon Feb 28, 2011 9:54 am
Forum: Data Sufficiency
Topic: What is the value of x*?
Replies: 29
Views: 13540

" At least one of the dice show 6 " translates to a formula " All outcomes minus All outcomes, excluding those having 6 ". All outcomes = 6*6*6*6 All outcomes except those having 6 = 5*5*5*5 In order to save time on further multiplication and subtraction, just calculate the unit ...

by rid

Sun Feb 27, 2011 9:34 am
Forum: Problem Solving
Topic: 4 Dice
Replies: 20
Views: 15907