Hint- if u know NUMBER SYSTEM or SETS it ll be easier for u to solve this...
N ,W ,Z ,........ ,R ,C .
Fill ....... By a appropriate letter
Now if A-1 B-2 C-3
Then let the no. for letter in ........be X
Find (X-19)*2 + 6
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Sol.n=
See the series it is short form-
Natural no-N Whole no.-W Integer - Z Rational no.-Q Real no- R Complex no.- C
This is in series as any term well defined subset of the next term
NUMBER SYSTEM OR SETS
So the ......is Q
Now for
A-1
B-2
C-3
..FOR Q-17. = X
On solving -
(X-19)*2+6
(17-19)*2+6
(-2)*2+6
(-4)+6
Answer = 2