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?
$C$, $N$, $D$, $Q$, $?$
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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.)
What I've got so far:
In Roman numerals (Since, Prof. Roman)
C = 100,
N = 90,
D = 500,
Q = 500 (deprecated)