# Number Series Logical Reasoning Questions and Answers Part 3

9. What comes instead of question mark?
8(97)6 ; 4(56)5 ; 6(75)4 ; 7(?)8

a. 98
b. 97
c. 89
d. 88

Explanation:

In 8(97)6 we can have 97- 86 = 11
4(56)5 we can have 56 - 45 = 11
6(75)4 we can have 75 - 64 = 11
So, the difference is 11.
? - 78 = 11
So, ? = 78+11 = 89

10. Fill the blanks
cdd ____cd _____c _____ ddc

a. d d c
b. d c d
c. d c c
d. c d c

Explanation:

From first term, we see that c comes before 'dd'. So, last blank has to be c.
From last term, we see that after dd, c comes. So, first blank is c.
From first term, we can infer that after cd, d comes so that we get cdd.
So, second blank has to be d.

11. YZA USB PKE ?
Which of the following will fit the above sequence?

a. OIF
b. MHD
c. MHF
d. NJC

Explanation:

Alphabets and their positions

 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

Position of Z is 26
Position of Y is 25
26-25 = 1 = Position of A

U=21; S=19; 21-19=2=B
P=16; K=11; 16-11=5=E

Only option 1 satisfies this condition
O=15; I=9; 15-9 = 6 = F

12. Find the missing term
3, 15, 35, ? , 99, 143

a. 81
b. 77
c. 63
d. 69