leeye84 wrote:
If X denotes one of two arithmetic operations, addition or multiplication, and if k is an integer, what is the value of 3 X k?
1) 2 X k = 3
2) 1 X 0 = k
Got E.
X can be multiply or add. For simplicity sake, I am going to change that to @.
So, 3@k can be 3+k or 3*k.
1) 2@k = 3. Two equations here. 2+k = 3 or 2*k = 3.
Possible k are 1 or 2/3. k is an integer, so k=1.
This gives 3+1 = 4 or 3*1 = 3
Either 4 or 3, INSUFFICIENT.
2) 1@0 = k. Two equations: 1+0 = k, 1*0 = k
k can be 1 or 0
for k=1, plug in: 3+1 = 4, 3*1 =3
for k=0, plug in: 3+0 = 3, 3*0 = 0
So it can be either 4, 3, or 0
INSUFFICIENT.
Together, still get either 4 or 3. INSUFFICIENT.