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Select the option that can replace the question mark (?) in the following series.​K11, 150, S19, 23W, A1, ??\frac{K}{11} ,\; \frac{15}{0}, \; \frac{S}
Question

Select the option that can replace the question mark (?) in the following series.
K11, 150, S19, 23W, A1, ??\frac{K}{11} ,\; \frac{15}{0}, \; \frac{S}{19} ,\; \frac{23}{W} ,\; \frac{A}{1}, \; \frac{?}{?}​​​

A.

5E\tfrac{5}{E}​​

B.

6E\tfrac{6}{E}​​

C.

E5\tfrac{E}{5}​​

D.

5F\frac{5}F​​

Correct option is A

GivenK11, 150, S19, 23W, A1, ??\frac{K}{11} ,\; \frac{15}{0}, \; \frac{S}{19} ,\; \frac{23}{W} ,\; \frac{A}{1}, \; \frac{?}{?} 
Logic: Each letter and number is increased by 4 in English alphabetical series.
K + 4 = O; O + 4 = S; S + 4 = W; W + 4 = A;  A + 4 = E
11 + 4 = 15; 15 + 4 = 19; 19 + 4 =23; 23 + 4 = 26 + 1; 1 + 4 = 5
So the number will be 5E\frac{5}{E}
Thus, the correct option is (a)

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