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topspin360
- Master | Next Rank: 500 Posts
- Posts: 103
- Joined: Sat Jun 02, 2012 9:46 pm
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I used to break down these type of problems through prime factorization. If the overall numerator can have a 9 (ie two 3's), then it is divisible by 9. but it didn't work in this scenario... just looking for a comprehensive thought process on how to go about this problem.
Is x^2 * y^4 an integer divisible by 9 ?
(1) x is an integer divisible by 3
(2) xy is an integer divisible by 9
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
Is x^2 * y^4 an integer divisible by 9 ?
(1) x is an integer divisible by 3
(2) xy is an integer divisible by 9
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
