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
    Commented May 15, 2019 at 0:36
  • $\begingroup$ Yeah you are right about the x. But no, the numbers dont need to be swapped. $\endgroup$ Commented May 15, 2019 at 0:38
  • $\begingroup$ Did you intentionally remove the first x (from 51x between first brackets)? $\endgroup$
    – Imus
    Commented May 15, 2019 at 13:40

1 Answer 1


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:
$(102,153,0) = (66,99,00)$
$(51,153,0) = (33,99,00)$
$(153,51,153) = (99,33,99)$


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.