Question 475865: Counterexample
Help,Please! take me for ever solve this problem,thanks in advance I attach lesson
http://imageshack.us/photo/my-images/8/page671.jpg/
http://imageshack.us/photo/my-images/851/page672.jpg/
I need help number 7 and 19
the key number 7 , n=3
the key number 19 , n=3
Answer by richard1234(7193)   (Show Source):
You can put this solution on YOUR website! You've essentially solved both problems. For #7 (Find a counterexample to the statement "2^n + 3^n is divisible by 4"), n=3 is a counterexample, because 8+27 is not divisible by 4. Similarly, n=3 is a counterexample to #19, which disproves the statement.
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