If “HACB” is written as “8132” in a certain language. Then how “DEFA” is coded.

Six persons, L, M, N, P, Q and R, are sitting in a row facing towards the north (not necessarily in the same order). There are three persons between P and M. P is not at any of the ends. There are three persons between L and Q. N is to the left of R. L is at one of the ends. M is to the right of P.
How many person are sitting to the left of N?

Directions: Answer these questions referring to the symbol-letter-number sequence given below:
7 2 A*3 K S Ϩ 5 M W $ 1 ß H ƴ 8 Z @ ∆ J F 9 P # £ X 4 C V 6 ? R

Four of the following five are similar in respect of their positions in the above sequence and hence form a group. Which one does not belong to the group?

Complete the series choosing the missing number:

324, 108, 36, 12, ______

There are 45 trees in a row. The lemon tree is 20^th from right end. What is the rank of lemon tree from left end?

Find the missing number in the following series:
43, 172, 86, 344, ?

Find out the correct answer for the unsolved equation on the basis of the given equations.
If 6 * 5 = 91
8 * 7 = 169
10 * 7 = 211
then 11 * 10 = ?

Study the following information carefully and answer the question given below.
In a club of 30 people, all of them belong to at least one group - Chess, Drama and Art.6 people belong only to the Art group. 5 people belong to all three groups. 2 people have joined the Chess and the Art group but not the Drama group. 15 people belong to the Art group. 2 people have joined only the Chess group. 3 people have joined only the Drama group. 

How many people belong to exactly one group?