Lanthane wrote:
Hi everyone,
There are a few problems I don't know to solve from GMAT Prep, could you please kindly help me? Test is on saturday and pressure is increasing
Thanks in advance !
Lots to type
Let me try to handle one question at a time. Here goes the first one.
Ques 1 : Jar containing red, blue and white marbels
Solution 1 -
The ques :[highlight]Is the prob of getting red > prob of getting white OR is the no of red> no of white[/highlight]
For sufficiency : the ans should be ALWAYS YES or ALWAYS NO
For Insufficiency – SOMETIMES YES SOMETIMES NO
Lets assume 2 numbers -
Case 1:w>r (which wud mean the chances of picking white will be more)
red=5; blue=5; white=10
Case 2: r>w (which wud mean chances of picking red will be more)
red=10 ;blue =5, white =5
Statement 1: (Refer to the highlight while ans the ques)
substitute the values
from case 1 – inequality doesn't hold true => thus red has to be more than white and ans to the ques is YES
from case 2 – inequality holds true => thus red has to be more than white and ans to the ques is YES
Since ALWAYS YES → statement 1 is sufficient; choice B, C, E gone
Statement 2:(Refer to the highlight while ans the ques)
substitute the values
from case 1 – inequality doesn't hold true => thus red has to be more than white and ans to the ques is YES
from case 2 – inequality holds true => thus red has to be less than white and ans to the ques is NO
SOMETIMES YES SOMETIMES NO => Insufficient
Ans :A
Confirm : If you try to plug with equal numbers of white and red in Statement 1, it will not hold true proving that it cant be equal either and thus prob cant be same for both.
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