Find the missing number?
1, 2, 4, 6, 10, 12, ____

Conditions;
(A) There are six members in a family – A, B, C, D, E & F, including two married couples.
(B) Two of them are doctors, one is a teacher, one is a clerk & two are the artists. Both the doctors are of same gender.
(C) A & C are in the same profession.
(D) Teacher is married to a doctor & an artist is married to clerk.
(E) A is an artist & E is male doctor. Both are unmarried.
(F) F is a husband of B.
To whom the teacher is married ?

In a row of people all facing north, Prince is 5th from the right end. Amit is 15th from the right end. Amit is exactly between Prince and Aditya. If Aditya is sixth from the left end of the line, how many people are there in the row?

oopqop_qoo_qo_oqo_pq 

Which of the following combination is not correct: - 

If 6 @ 4 @ 7 = 101 and 2 @ 5 @ 11 = 150, then what is the value of A in A @ 8 @ 9 = 289?

212 : 436 : 560 : ?

In the following question, select the related letter/letters from the given alternatives.
PAL : RDP : : MRF  :  ?