gmatophobia wrote:
DS Question 2 - Nov 23
What is the value of integer z?
(1) z is the remainder when positive integer y is divided by positive integer (y - 1)
(2) y is not a prime number
Source: Veritas Prep | Difficulty: Hard
Easiest way to do this imo is to test values:
gmatophobia wrote:
DS Question 2 - Nov 23
What is the value of integer z?
(1) z is the remainder when positive integer y is divided by positive integer (y - 1)
(2) y is not a prime number
Source: Veritas Prep | Difficulty: Hard
Target: Z=?
1) z is R when y/y-1, y is an int >0.
testing: y=2, 2/1, R0 (z=0), y=3, (3/2), R1, (z=1). Therefore, NS. We have two cases.
2) y is non-prime. no info about X, insuff.
3) since y is non-prime, we can exclude the case of y=2. Let’s test some more values:
y=6, 6/5, R1 (z=1)
y=8, 8/7, R1 (z=1)
y=9, 9/8, R1 (z=1)
Clear pattern here. Therefore, C.
kapil1995 wrote:
gmatophobia wrote:
DS Question 2 - Nov 23
What is the value of integer z?
(1) z is the remainder when positive integer y is divided by positive integer (y - 1)
(2) y is not a prime number
Source: Veritas Prep | Difficulty: Hard
A
Almost... the case of y=2 makes A NS.