ANSWER : 30

Explanation : : 2+1=3 (2nd term) 3x2=6 (3rd term) 6+1=7 (4th term) 7x2=14 (5th term) 14+1=15(6th term) 15x2=30(7th term)

ANSWER : RXB

Explanation : : +6 +4 C→I→M +6 +4 H→N→R +6 +4 M→S→W Similarly +6 +4 R→X→B

ANSWER : ZADE

Explanation : : +1 +3 +1 B→C→F→G +1 +3 +1 J→K→N→O +1 +3 +1 R→S→V→W Similarly,this rule follows in +1 +3 +1 Z→A→D→E

ANSWER : b a b c c

Explanation : : The letter series is abcbcacababcbcacab The sequence is ab/cbcacab/ab/cbcacab

ANSWER : 5,2,4,3,1

Explanation : : The descending order according to their meaning is Annual(yearly) Bi-annual(Twice a year) Monthly (once in 30 days) Fortnightly(Twice in a month) Weekly(once in 7 days) The correct descending order is 5,2,4,3,1