GCAT Number and Letter Sequences 4

Question 1

What number is missing? 2, 6, 18, ___, 162

Accepted Answer

54

Answer

Each term is multiplied by 3, so 18 × 3 = 54.

Question 2

What letter comes next in the series? Z, W, T, Q, ___

Accepted Answer

N

Answer

Each letter moves back 3 positions, so Q − 3 = N.

Question 3

Complete the sequence: 1, 8, 27, 64, ___

Accepted Answer

125

Answer

These are perfect cubes (1³, 2³, 3³, 4³), so the next is 5³ = 125.

Question 4

Which comes next? AZ, BY, CX, DW, ___

Accepted Answer

EV

Answer

The first letter advances (A→B→C→D→E) and the second retreats (Z→Y→X→W→V), giving EV.

Question 5

What is missing? 4, 7, 12, 19, 28, ___

Accepted Answer

39

Answer

Differences increase by 2 each time (+3,+5,+7,+9,+11), so 28 + 11 = 39.

GCAT - General Cognitive Ability Test Practice Test