Given this sequence of letters:

 _, B, G, C, R, M, Y, _

What is the first and last letter?

hint 1

each letter represent a color

hint 2

C represents the color Cyan and M for Magenta

The answer is responded, but try to find the sequence behind it. Explain Why

the sequence is related a order of HTML Hex Color Codes.

  • $\begingroup$ Hmm, no luck so far. Is it trivia related? I.e. do we need to know about a sport to answer it? $\endgroup$ May 11, 2015 at 13:01
  • $\begingroup$ no, its not about a sport $\endgroup$
    – Christian
    May 11, 2015 at 13:02
  • $\begingroup$ first is A right ? :) $\endgroup$ May 11, 2015 at 13:06
  • $\begingroup$ @user2408578 no :( $\endgroup$
    – Christian
    May 11, 2015 at 13:07
  • $\begingroup$ I'm thinking colour models on first glance. $\endgroup$ May 11, 2015 at 13:08

2 Answers 2


As HumphreyTheHater stated,

Black and White, or B and W, respectively

But why are these the proper letters?

Black = 0x000000
Blue = 0x0000FF
Green = 0x00FF00
Cyan = 0x00FFFF
Red = 0xFF0000
Magenta = 0xFF00FF
Yellow = 0xFFFF00
White = 0xFFFFFF

These colors follow the standard binary counting system, using 00 for 0 and FF for 1:

  • $\begingroup$ correct answer :D $\endgroup$
    – Christian
    May 11, 2015 at 14:37
  • $\begingroup$ btw, this question was bad? beacuse I got 2 negative votes, it's my first question and I want know if there is something bad . $\endgroup$
    – Christian
    May 11, 2015 at 14:52
  • 1
    $\begingroup$ @Christian I would think the main reason would be because it was vague. You could have cryptically referenced the fact that they were web based colors. After seeing that and doing some pondering was when it clicked for me, but that's because I'm a developer and stare at values like this every day. $\endgroup$
    – tfitzger
    May 11, 2015 at 15:04

B & W


Black and white? Seems like the two obvious missing 'colours' from cyan, yellow, red, blue, green

  • $\begingroup$ yes it's the answer, i give the second hint but it's didn't need $\endgroup$
    – Christian
    May 11, 2015 at 13:27
  • $\begingroup$ so how this sequence would be? B, B, G, C, R, M, Y, W ? B is already there but... $\endgroup$
    – Mox Shah
    May 11, 2015 at 13:28
  • $\begingroup$ @Humphreythehater but there is a sequence behind this, do you know? $\endgroup$
    – Christian
    May 11, 2015 at 13:30
  • $\begingroup$ @MokshShah B is repeated, but the answer is B, B, G, C, R, M, Y, W $\endgroup$
    – Christian
    May 11, 2015 at 13:31
  • $\begingroup$ @Christian Then what does that 2nd B represent ? $\endgroup$
    – Mox Shah
    May 11, 2015 at 13:34

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