Prof. Roman of Chemistry department as you all know is quite unorthodox..here is his Quiz. It is Monday Morning and it is time for Prof. Roman’s unusual quizzes to his chemistry class.

What is the missing letter?

$C$, $N$, $D$, $Q$, $?$

  • 1
    $\begingroup$ chemistry tag? knowledge? math? $\endgroup$ Jun 17, 2019 at 9:10
  • 1
    $\begingroup$ Nope..I put right tag...no other tags needed except knowledge..will add $\endgroup$
    – Uvc
    Jun 17, 2019 at 9:12
  • 1
    $\begingroup$ I suggest you not using the words chemistry when it doesn't help at all but mislead the solvers... $\endgroup$ Jun 17, 2019 at 23:05
  • $\begingroup$ Will do..but is clearly stated in the puzzle..he gives off topic quizzes..if it is less confusing..I will refrain in future $\endgroup$
    – Uvc
    Jun 18, 2019 at 0:48

2 Answers 2


This set of us may continue:

C, N, D, Q, (H), D,

If these represent:

Cent, Nickel, Dime, Quarter, (Half dollar), Dollar so most commonly a D
(I wonder if Prof. Roman is a grandpa.)

  • $\begingroup$ why unorthodox and roman? nice try tho $\endgroup$ Jun 17, 2019 at 11:49
  • $\begingroup$ Got it Tom..continuing from his earlier problem..he loves to test students lateral thinking..no reference to chemistry tag.. $\endgroup$
    – Uvc
    Jun 17, 2019 at 13:53
  • $\begingroup$ Tom seems to understand Prof. Roman pretty good..he solved his earlier problem too.. $\endgroup$
    – Uvc
    Jun 17, 2019 at 13:57

What I've got so far:

In Roman numerals (Since, Prof. Roman)

As follows

C = 100,
N = 90,
D = 500,
Q = 500 (deprecated)

  • 1
    $\begingroup$ Wrong path..you never know what he is going to ask..his students know no subject is off limits for him.. $\endgroup$
    – Uvc
    Jun 17, 2019 at 10:35
  • $\begingroup$ @pranav I was going the same route since rot13(D pna or pbafvqrerq nf 500,000 va fbzr pnfrf) $\endgroup$
    – Gamora
    Jun 17, 2019 at 11:21

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