5 Fragen / Questions

[lukas]

I'm confused by the formulation of answers 6-9 it says: for all n where either n (+/-) 1 or n are a multiple of (3/4)

I think it's supposed to say: for all n and n (+/-) 1 where n is a multiple of (3/4)

With your formulation answer 6 would be true with n= 4, n-1= 3 and n=5, n-1= 4, so the possible values of n would be 3, 4 and 5

With my formulation answer 6 would only be true with n= 4, n-1= 3

No, it is meant the way it is written. I think you made a logical mistake. n=3 is not included in statement number 6, only n=4 or n=5. This is, because for n=3 neither n nor n-1 is a multiple of 4.
Hopefully, this helps you. Have fun solving.

You're right. I read the logic wrong. Thank you!!

No problem. Always happy to help. That's what this forum is for.