शृंखला में लुप्त (?) पद ज्ञात कीजिये। NA, PC, RE, TG, ?, XK, ZM A. IV B. VI C. VII D. VJ

The first letters go N, P, R, T, ?, X, Z (skipping one letter each time), so the missing one is V. The second letters go A, C, E, G, ?, K, M, so the missing one is I. The answer is VI.