Saturday

December 20, 2014

December 20, 2014

Posted by **Math_stuck** on Tuesday, February 26, 2008 at 9:49am.

- direct method-Math -
**drwls**, Tuesday, February 26, 2008 at 10:21amIf n is divisible by 3, it can be written 3a, where a is an integer.

n^2 = 9 a^2, where a^2 is also an integer, is also divisible by three, since 9 = 3 x 3.

I don't have your notes so have no idea what kind of proof they expect.

**Answer this Question**

**Related Questions**

Discrete Math - Use mathematical induction to prove the truth of each of the ...

maths - can you answer this question: prove that a number 10^(3n+1), where n is ...

Math - Use mathematical induction to prove that 5^(n) - 1 is divisible by four ...

Discrete Math - 1. Assume that n is a positive integer. Use the proof by ...

IB HL Math - I need to that if there is better way to prove the following: I am ...

Math - The question is this: You know that a number is divisible by 6 if it is ...

Math PLEASE HELP!!! - Which of the following is false? a. A number that is ...

Discrete Math - Use mathematical induction to prove the truth of each of the ...

math - can you answer this question in a different and more logical way than ...

Math - Divisibility and Factors - If c and d are integers, d is divisible by 30...