if y is an integer, is y^3 divisible by 9?
(1) y is divisible by 4
(2) y is divisible by 6
Again, I got the right answer but unsure of whether my approach is right. Please explain this.
primes and divisibility 2
This topic has expert replies
- arora007
- Community Manager
- Posts: 1048
- Joined: Mon Aug 17, 2009 3:26 am
- Location: India
- Thanked: 51 times
- Followed by:27 members
- GMAT Score:670
Gurpinder wrote:if y is an integer, is y^3 divisible by 9?
(1) y is divisible by 4
(2) y is divisible by 6
Again, I got the right answer but unsure of whether my approach is right. Please explain this.
the answer is B,
if we were to solve it....
1) take y=4 the answer is No take y=12 the answer is yes so INSUFF
2) y=2*3*x so y^3 = 2*2*2*3*3*3*x^3 so its but natural that y^3 is divisible by 9.
https://www.skiponemeal.org/
https://twitter.com/skiponemeal
Few things are impossible to diligence & skill.Great works are performed not by strength,but by perseverance
pm me if you find junk/spam/abusive language, Lets keep our community clean!!
https://twitter.com/skiponemeal
Few things are impossible to diligence & skill.Great works are performed not by strength,but by perseverance
pm me if you find junk/spam/abusive language, Lets keep our community clean!!