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Nicolin
Nicolin asked
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Last Modified: 2017-05-09
Prove by mathematical induction that n*2+n+41 is odd for all natural numbers n
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John TsioumprisSoftware & Systems Engineer
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Enabbar OcapEmbalsamador
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Commented:
He ^ types faster ;7)
John TsioumprisSoftware & Systems Engineer
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Commented:
Usually we start like this
For n=1 it stands.
Then we say that is true for every n<k
And then we take the case n=k....
And finally we try to prove it for n=k+1
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Well she made a mistake it's       n*2-n+41.       I was about to ask the same question
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Commented:
If n=3 that becomes 6-3 +41
Still even.

As suggested earlier it looks like you should be using the ^ (power of) sign instead of *(multiply)

If it is you that asked the question.
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Commented:
It looks like I have been missed out of the shares. I think my points are as valid as anyone else's. I offered a suggestion of a way to approach the problem as well as a question to the op about the numbers involved. I think I deserve a share.

Commented:
Please remove me from the list of solvers, because my comment is incorrect. An odd number squared it not even (eg: 3²=9). It in fact relies on the fact that a number pair (n, n+1) when multiplied is always even whatever n is. Theefore adding any odd number produces an odd result.
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Commented:
Big Rats latest comment is correct and should have been noted by me earlier. He is to be congratulated on his latest (and many previous insightful comments) and his suggestion followed.
Give the points to Thibault since he objected to the original distribution
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No don't do that. I was only feeling that I had been missed from the share out.
Share to everyone or give it all to the best answer.
It would be good not to delete it, and leave it as an example of what happens when you ask a question and don't come back to it.
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Commented:
How about the following even split:

  Accepted answer: 100 points for d-glitch's comment #a42051661
  Assisted answer: 100 points for John Tsioumpris's comment #a42051586
  Assisted answer: 100 points for John Thibault St john's comment #a42051590
  Assisted answer: 100 points for aburr's comment #a42051690
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Commented:
You missed BigRat. Surely those were useful comments?

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