The recommended time to take a math test is 23 minutes. you complete it in 18 minutes. what is the percent change between your t
2 answers:
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Answer:
It is proved that if is even the n is even.
Step-by-step explanation:
Given n is any integer.
To show is even then n is even.
Proving by contrapositive suppose is odd. Then we need to show n is odd.
Then, letting k is a ny integer,
Now since (2k+1) is odd therefore n is odd.
Conversly let n is odd, then,
since 2k+1 is odd so is odd.
This proves, if n is even then is even.