Number Series - Logical Reasoning

Find out what should come in place of the Question mark (?) in the following  Number Series.

Q1: 1, 3, 4, 7, 11, 18, 29, ?

A. 31
B. 39
C. 43
D. 47

Answer : D

Solution : Each number is the Addition of Previous Two Numbers

Q2: 975,864, 753, 642, ?

A. 431
B. 314
C. 531
D. 532

Answer : C

Solution : Each number is Subtraction of 111

Q3: 8, 24, 12, ?, 18, 54

A. 28
B. 36
C. 46
D. 38

Answer : B

Solution : 8*3=24, 12*3=36, 18*3= 54