# FP1 Proof by induction Help

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#1
Hi, I was practising proof by induction and came across this question (9b june 2014 IAL) which I think I've correctly proved. However, the mark scheme doesn't show my method among the alternatives so I was wondering if I would still get the marks. I skipped basis case and conclusion for timing purposes. Can someone verify whether this method is correct or not?

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4 years ago
#2
(Original post by Amarante)
Hi, I was practising proof by induction and came across this question (9b june 2014 IAL) which I think I've correctly proved. However, the mark scheme doesn't show my method among the alternatives so I was wondering if I would still get the marks. I skipped basis case and conclusion for timing purposes. Can someone verify whether this method is correct or not?

Posted from TSR Mobile
Looks fine though generally you need make use of the fact that is divisible by 18 directly, not its rearrangement - exam boards could be picky on that, not sure.
0
4 years ago
#3
(Original post by Amarante)
Hi, I was practising proof by induction and came across this question (9b june 2014 IAL) which I think I've correctly proved. However, the mark scheme doesn't show my method among the alternatives so I was wondering if I would still get the marks. I skipped basis case and conclusion for timing purposes. Can someone verify whether this method is correct or not?

Posted from TSR Mobile
That looks fine, although in general it's probably safer, to use , where , proving that is divisible by 18, and making deductions accordingly.
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#4
(Original post by _gcx)
That looks fine, although in general it's probably safer, to use , where , proving that is divisible by 18, and making deductions accordingly.
(Original post by RDKGames)
Looks fine though generally you need make use of the fact that is divisible by 18 directly, not its rearrangement - exam boards could be picky on that, not sure.
Thank you very much, I'll stick to the safer option

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