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.
ENCYCLOPEDIA

Find the odd word/letters/number pair from the given alternatives.

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

YZ, GH, OP, WX, ?

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

FN, KL, PJ, ?, ZF

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

TU, AB, HI, ?

In the following question, select the related letters from the given alternatives.

NPBG : OQCH : : AJOT : ?

In a row, there are 12 professors between Akash and Bhumi and Akash being the first professor in the row. There are 6 professors between Bhumi and Charu. If there are 15 professors after Charu, then how many minimum professors are there in the row?

If 5Δ1 = 40, 9Δ9 = 0 and 7Δ1 = 60, then find the value of 4Δ9 = ?