Verbal Reasoning - Mental Ability Questions

In the following question, from the given alternative words, select the word which cannot be formed using the letters of the given word.
REASONABLE

A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.
XIIIII, IXIIII, IIXIII, IIIXII,IIIIXI, ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.

9, 26, 60, 111, ?

In the following question, select the related letter from the given alternatives.
DE : O : : AF : ?

Three words in bold letters are given in each question, which have something in common among themselves. Out of the four given alternatives, choose the most appropriate description about these three words.

Spinach: Fenugreek: Celery

Select the missing number from the given options?

MATHEMATICS is related to NUMBERS in the same way HISTORY is related to