Choose or find odd number - 51 , 144 , 64 , 121 , 256

A. 51

Complete analogous pair - Tuberculosis : Lungs : : Cataract : ?

D. EYE

In following number series, two terms have been put within brackets. Choose the appropriate option - 2,6,12,20,30,42,56,x

D. 72

(i). Seven students P, Q, R, S,  T, U and V take a series of tests.
(ii). No two students get similar marks.
(iii). V always scores more than P.
(iv). P always scores more than Q.
(v). Each time either R socres the highest and T gets the least, or alternatively S scores the highest and U or Q scores the least. If R gets most, V should be ranked not lower than :

C. FOURTH

If ROBUST is coded as QNATRS in a certain language, which word would be coded as ZXCMP ?

D. AYDNQ