Test Index

SSC CPO SI and ASI Model Paper 4

Directions (Q. 7–9): What will come in place of the question mark (?) in the following number series?

Question : 7 of 200

Marks: +1, -0

AN14, BO30, CP48, DQ68, ER90, ?

Solution:

Concept:

Each term has a letter pair and a number equal to the product of the letters' alphabet positions.

Explanation:

The first letters are

A, B, C, D, E

, so the next is

F

The second letters are

N, O, P, Q, R

, so the next is

S

Thus the letter pair is

FS

For the number:

A=1, N=14 \Rightarrow 1 \times 14 = 14

B=2, O=15 \Rightarrow 2 \times 15 = 30

C=3, P=16 \Rightarrow 3 \times 16 = 48

D=4, Q=17 \Rightarrow 4 \times 17 = 68

E=5, R=18 \Rightarrow 5 \times 18 = 90

So for

F=6, S=19

6 \times 19 = 114

Hence the missing term is

FS114

Answer:

FS114

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