# SOLUTION: 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

Algebra ->  -> SOLUTION: 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      Log On

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 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=3Answer by richard1234(5390)   (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.