The following sets of numbers are connected through a common rule/patern. Find the missing number(?)

$(255,153,51x)(153,0xx,51x) = 669900$

$(255,204,51x)(204,51x,51x) = 339900$

$(153,153,204)(0xx,204,51x) = ?$

  • $\begingroup$ The $0x$ on the first row, is it intentional or should be $0xx$? Then on the last row, the second number in each triplet, shouldn't they be swapped? $\endgroup$
    – athin
    May 15 '19 at 0:36
  • $\begingroup$ Yeah you are right about the x. But no, the numbers dont need to be swapped. $\endgroup$ May 15 '19 at 0:38
  • $\begingroup$ Did you intentionally remove the first x (from 51x between first brackets)? $\endgroup$
    – Imus
    May 15 '19 at 13:40

My guess is



We need to calculate the difference between the triplets, so we have:

$(255,153,51x) - (153,0xx,51x) = (102,153,0xx)$
$(255,204,51x) - (204,51x,51x) = (51x,153,0xx)$
$(153,153,204) - (0xx,204,51x) = (153,51x,153)$


Ignoring $x$, translate each number into hex (base-$16$), so we get:
$(102,153,0) = (66,99,00)$
$(51,153,0) = (33,99,00)$
$(153,51,153) = (99,33,99)$


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