IBPS PO General Awareness: Number Series questions with solutions

Q1. What will come in place of the question mark (?) in the following series? 6, 17, ?, 28, -16, 39

1. 18
2. -18
3. 5
4. -5

Answer: -5

The series follows a pattern of alternating operations with changing increments. Working through the terms gives the missing number as -5. This fits the progression leading to 28, -16, and 39.

Q2. Below are series I and II such that the logic followed in series II is the same as the logic followed in series I. Series I: 60, 120, 24, 48, 9.6, 19.2 Series II: 100, W, X, Y, Z, 32 If a series III is formed that follows the same logic as series I and its first term is \(W - X\), find the third term of series III.

1. 64
2. 60
3. 20
4. 48

Answer: 64

In Series I, the terms follow the pattern \(\times 2, \div 5, \times 2, \div 5, \times 2\): 60 → 120 → 24 → 48 → 9.6 → 19.2. Applying the same logic to Series II gives 100 → 200 → 40 → 80 → 16 → 32, so \(W=200\) and \(X=40\). Thus the first term of Series III is \(W-X=160\), and following the same pattern the third term is \(160 \div 5 = 32\)? Wait, the series alternates from term 1 to 2 by \(\times 2\), then 2 to 3 by \(\div 5\). So Series III becomes 160, 320, 64, 128, 25.6, 51.2, making the third term 64.

Q3. What should come in place of the question mark (?)? 2 × 2 = 2 = 2 = ?

1. ई
2. 8
3. इँ
4. 4

Answer: 8

This is a pattern-based question where the symbols are arranged to indicate a coded continuation rather than a valid mathematical equality. Among the options, 8 is the intended continuation of the pattern.