VJesus12 wrote:m=?
1) 5 is a factor of m
2) m is a prime number
Target question: What is the value of m?
Statement 1: 5 is a factor of m
There are several values of m that satisfy statement 1. Here are two:
Case a:
m = 5
Case b:
m = 10
Since we cannot answer the
target question with certainty, statement 1 is NOT SUFFICIENT
Statement 2: m is a prime number
There are several values of m that satisfy statement 2:
m = 2,
m = 3,
m = 5,
m = 7,
m = 11, etc
Since we cannot answer the
target question with certainty, statement 2 is NOT SUFFICIENT
Statements 1 and 2 combined
Statement 2 tells us that m is a prime number. This means that m has EXACTLY 2 factors: 1 and m
Statement 1 tells us that 5 is a factor of m
This means that
m MUST equal 5
Since we can answer the
target question with certainty, the combined statements are SUFFICIENT
Answer: C
Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
