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1)

I, X, J, W, K, V, L, _?


A) M

B) U

C) S

D) T

Answer:

Option B

Explanation:

The given series is an alternate series
I+1, J+1, L is one series
X1, W1, V1, _ 

X-1=W, W-1=V, V-1=22-1=21
21st letter is U.