. If a, b, and c are integers, is the number divisible by 3?
(1) a + b is divisible by 3.
(2) c is divisible by 3.
OA- B.....Pls Explain
Pls Explain
This topic has expert replies
-
- Legendary Member
- Posts: 1153
- Joined: Wed Jun 20, 2007 6:21 am
- Thanked: 146 times
- Followed by:2 members
If a, b, and c are integers, is the number divisible by 3?
which number are we talking about is it a+b+c or abc or a,b & c are three digits of the number?
which number are we talking about is it a+b+c or abc or a,b & c are three digits of the number?
-
- Legendary Member
- Posts: 1153
- Joined: Wed Jun 20, 2007 6:21 am
- Thanked: 146 times
- Followed by:2 members
The answer is BNycgrl wrote:. If a, b, and c are integers, is the number 3(a+b)-c divisible by 3?
(1) a + b is divisible by 3.
(2) c is divisible by 3.
From the question stem itself we know that a+b will be multiple of 3, therefore we just have to find the value of C.
Statement I
a + b is divisible by 3
we dont know anything about C. Insufficient.
Statement II
C is a multiple of 3, therefore 3(a+b)-c will always be a multiple of 3 hence divisible by 3.
Sufficient.
Here is rule that you can learn.
If a and b are divisible by n then a-b & a+b both will be divisible by n