That's another interesting concept you mention there.

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sbi

That's an interesting idea. But it's just a coincidence that it works here. Check for example "18" which is not divisible 909, but according to your rule it would be. Actually you were supposed

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sbi or pal

You are doing really strange things at 3 and 4a)

Stop guessing, start thinking, although that is only 50% wrong. That's the last time I'll correct you!

lumberjack

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I just discovered that I made a small mistake in 4 a): You need to find 2 missing factors! And by the way your solution for 4 a) is wrong anyway. but not sure of trick to find out about 909. It is still

Yes, I am totally sure.

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sbi or pal

Yeah. The ± makes it look way harder than it actually is.

Ah, I see. You are already lost too deep inside your bubble of misinformation to ever get out again. Your belief is so undisturbed that you don't let even the simplest questions into your brain. it is,

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That doesn't make it right :P

Yeah. That's a sad truth. Once someone like you has been fooled into flatearth it is, based on my experience so far, impossible to convince them of the truth. I'll try to anyway. Did you even once take

sbi