1. C
We need info on both x & y , using both we get x + z + y + z is even => x + y + 2z is even
2. D
I => 8w+4x+2y+z = 11 now analyze
w has to be 1 else yo wont get to 11
if w =1 x has to be 0 else you will get to 12
and y and z has to be 1 to get to 11,
so you get values for all variables. Hence Suff.
SImilarly, eqn in II is also suff. HENCE D
3. C
We need info on both r,s & u,v so both eqn are needed
Try to put values you will get complementary values
if r=0.8 & s=0.2
u=0.2 & s=0.8
So they are equidistant.
XYZ, Coordinate system
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Source: Beat The GMAT — Data Sufficiency |
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vikram4689
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