A series is given, with one term missing. Choose the correct alternative from the given options that will complete the series.
51    (?)    57      65      81    

What day of the week will be on 1st January 2033?

Find the missing (?) in the series AIQ, BJR, CKS, DLT, ?, 

In the following question, by using which mathematical operators will the expression become correct?
15 3_4_20 

Funk: Vitamins: Curie: ? 

In each of the following questions, five words are given. Which of them will come in the middle if all of them are arranged alphabetically as in a dictionary?

If 'rain' is 'water', 'water' is ' road ', 'road' is 'cloud' , 'cloud' is 'sky', 'sky' is 'sea' sea is 'path', where do aero planes fly ? 

Find the odd word from the following: