Which pair of numbers is the odd one out?

C. 4, 6

In the sequence: M, N, O, ?, Q, what letter is missing?

A. P

If the word 'COLD' is coded as 'DPME', how is 'WARM' coded in the same way?

A. XBSN

Identify the odd number pair from the following options.

B. 12, 18

What is the L.C.M. of the polynomials x^2 - 1 and x^2 - 4?

A. (X - 1)(X + 1)(X - 2)(X + 2)