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

Answer: c.  89

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

Answer: 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.
Answer is c d c


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

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

Answer: a. OIF

Explanation:

Alphabets and their positions

ABCDEFGHIJKLMNOPQRSTUVWXYZ
1234567891011121314151617181920212223242526

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

Answer: c.  63

Explanation:

Here if we look closely we can see that 3 is near to 4 which is 22
That is 3 = 4 -1 = 22 - 1
Also 15 is near to 16 which is 42
That is 15 = 16-1 = 42 - 1
And 35 = 36-1 = 62 - 1
99 = 100 - 1 = 102 - 1
143 = 144-1 = 122 - 1
So it is squares of even numbers i.e. 2, 4, 6, etc. so next should be 8 and then 10, 12.
So missing term is 82 - 1 = 64 - 1 = 63

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