Hi,amitansu wrote:Ans A here.
From stem 1 : x-y+1<0>x-y<-1 i.e (x-y) negative i.e. x<y ;sufficient
From stem 2 : x-y-1<0>x-y<1 here it could be 0, more than zero or even negative.So not sufficient.
1. S is a set of integers such thatamitansu wrote:Go ahead and post 'em....
Amit
Amit,amitansu wrote:Vikas,
Just a small request : Post one q per thread.So that it would be better to refer.
However for q i can you put it in a better way ? i couldn't follow it !!
For q 2 :
Ans would be E.
From 1 : x=3q+1 (q quotient here)
different values of x are 4,7,10,13 ......but no idea about y so insufficient
From 2: y=9q+8
so different values of y would be 17,26,35,44....still no idea about x . so insufficient.
Combining both also we have many combinations of xy which wouldn't verify whether (xy+1) is divisible by 3 oe not.Insufficient
For q 3 :
From 1 : x^2<1> +0r- (x)<1 which is mod(x)<1 here x being a factor.So sufficient.
From 2: mod(x)<1>+or-(x)<1/x (x is a factor here) but with -x being a factor would contradict the value.For example let x =1/2
so 1/2<1>1/2<2; but is -1/2 < 1/-(1/2) no.
However we are asked about whether mod(x)<1 ?
and from above we knew, yes definitely.So suficient.
Ans D.
mehravikas wrote:1. S is a set of integers such that
i) if a is in S, then –a is in S, and
ii) if each of a and b is in S, then ab is in S.
Is –4 in S?
(1) 1 is in S.
(2) 2 is in S.
Hey Amit,
I have posted the q on a new thread, but I thought to give you some explanation on the q here. From above, the set should be something like -
S = {a, -a, b, ab}
1 is in S = {1, -1, b, 1 * b}
not sufficient to say whether -4 is in the set
2 is in S = {2, -2, b, 2b}
not sufficient to say whether -4 is in S
To my surprise the answer is 'B'. Let me know, if the explanation is of any help to you.
Vikas
What about point B {2 is in S}netigen wrote:(a) says that 1 is in the set. It does not say that only 1 is in the set. So the ans is -4 may or may not be in the set hence insufficient.
mehravikas wrote:1. S is a set of integers such that
i) if a is in S, then –a is in S, and
ii) if each of a and b is in S, then ab is in S.
Is –4 in S?
(1) 1 is in S.
(2) 2 is in S.
Hey Amit,
I have posted the q on a new thread, but I thought to give you some explanation on the q here. From above, the set should be something like -
S = {a, -a, b, ab}
1 is in S = {1, -1, b, 1 * b}
not sufficient to say whether -4 is in the set
2 is in S = {2, -2, b, 2b}
not sufficient to say whether -4 is in S
To my surprise the answer is 'B'. Let me know, if the explanation is of any help to you.
Vikas
