Weekly GMAT Practice Question - Can You Answer It?
Monday May 19, 2008
Today's Monday, which means it is time for our weekly GMAT practice question. As always, Intergrated Learning has provided us with a fantastic GMAT challenge.
Start by reading the question and the statement below it. Then, see if you can choose the right multiple choice answer:
Is the two-digit integer k (k > 20) a prime number?
1) The units digit of k is a multiple of the tens digit of k.
2) The units digit of k is 3.
A) Statement (1) ALONE is sufficient, but statement (2) is not sufficient.
B) Statement (2) ALONE is sufficient, but statement (1) is not sufficient.
C) BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D) EACH statement ALONE is sufficient.
E) Statements (1) and (2) TOGETHER are NOT sufficient.
So, what is your guess? Is the answer A, B, C, D or E? You can post your guess in the comments (see below) or discuss the question in the Business School Community Forum.
Don't forget to check back tomorrow for the answer!
For more GMAT challenges, check out the archive of GMAT questions or visit the Integrated Learning Blog.
Start by reading the question and the statement below it. Then, see if you can choose the right multiple choice answer:
Is the two-digit integer k (k > 20) a prime number?
1) The units digit of k is a multiple of the tens digit of k.
2) The units digit of k is 3.
A) Statement (1) ALONE is sufficient, but statement (2) is not sufficient.
B) Statement (2) ALONE is sufficient, but statement (1) is not sufficient.
C) BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D) EACH statement ALONE is sufficient.
E) Statements (1) and (2) TOGETHER are NOT sufficient.
So, what is your guess? Is the answer A, B, C, D or E? You can post your guess in the comments (see below) or discuss the question in the Business School Community Forum.
Don't forget to check back tomorrow for the answer!
For more GMAT challenges, check out the archive of GMAT questions or visit the Integrated Learning Blog.
Comments
My guess is A, but I am curious to see what everyone else thinks.
C) BOTH statements TOGETHER
Answer is E. If you read carefully, the statements are mutually exclusive. (1) states that that 1’s digit is a multiple of the 10’s digit. If the 1’s digit is a 3, per (2), then there is no way 3 is a multiple of the 10’s digit.
(1) by itself is not sufficient because the relationship has no meaning when it comes to figuring out prime numbers.
(2) is not sufficient simply because 33, 63, and 93 are not primes. (The rest are however).
I would say C because that makes the question easier to answer, but A is more likely. If you know your prime numbers, the first statement is all you need to solve it. The second statement is just a hint.
Maybe this is twisted, but…
If the units is 3 and the first digit may be considered a multiple of 3 (can it??) then the resultant numbers are 33,63,93,123,153, and so on. None are prime because all are perfectly divisible by 3. Therefore, E.