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1 vote
(c) 22n+1 +7 is a multiple of 3 for n > 1.​

User Alex Deem
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1 Answer

5 votes

Well if so then


</p><p>3\mid(22n+1+7)\wedge n>1 \\</p><p>3\mid2(11n+4)\wedge n>1 \\</p><p>

Which is false since
3\mid2 is false. However we have
3\mid2x is true if
x\mid3 or in this case
11n+4\mid3.

So it's true in some cases false.

Hope this helps.

User Anders Jakobsen
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