5
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I found this paper on Grandpa's desk with a bunch of letters, big and bold, with a question:

Which two letters come next in the sequence? He even wrote down four choices

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enter image description here

Which two letters go next?

Curiously he had scribbled at the bottom:

" I don't think I can go any further in this sequence"

Why?

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0
13
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Perhaps Grandpa's sequence is based on

$\sqrt{2} = 1.41421356 ...$

When writing l, M, l, M, X consider the number of

straight lines strokes: 1, 4, 1, 4, 2 then the next digits 1, 3 match the option I, F

I don't think I can go any further in this sequence as the next

number is 5 and no (straight) letter has takes five: A, E, F, H, l, K, L, M, N, T, V, W, X, Y, Z

Title: Bunch of letters? It is all Greek to me

Pythagoreans discovered that the square root of two is irrational, and a proof is in Euclid.

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    $\begingroup$ I absolutely did expect an answer from you @Tom. May be I should not have commented on the "Greek" being important.:) Wonderful. BTW some people (Wikipidia) call this a Pythagoras Constant $\endgroup$
    – DrD
    Oct 12 '20 at 18:54
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    $\begingroup$ rot13(Avpr zvfqverpgvba jvgu gur ebzna ahzrenyf, naq gur 'S' juvpu vf oernxf gur cnggrea. Xvaq bs unq gb fvapr gurer'f ab guerr-fgebxr ebzna ahzreny, hayrff lbh pbhag 'Q', naq jebgr vg ebzna-fglyr nf n gevnatyr vafgrnq bs pheirq.) $\endgroup$ Oct 13 '20 at 14:02
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I think,

XL

Explanation

I think Grandpa is saying, "I'm I'm XXL".
Big and bold, Can't go any further in this sequence are probably mentioning about Grandpa's cloth size. I think it's not good for grandpa to put on more weight

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  • $\begingroup$ His logic is very different, The title is important $\endgroup$
    – DrD
    Oct 12 '20 at 13:50

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