**Number Series Questions For Railway Group-D PDF:**

Download Number Series Questions For Railway Group-D PDF with detailed solutions. Important Practice Ratio and Proportion questions based on previous year railway exam papers.

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**Question 1: **Identify the wrong number in the following series–

216, 163, 120, 72, 24

a) 216

b) 163

c) 72

d) 214

**Question 2:** 5 pencils and 4 erasers cost Rs 13 whereas 9 pencils and 5 erasers cost Rs 19 Then the price of 6 pencils and 3 erasers is

a) Rs 9

b) Rs 12

c) Rs 15

d) Rs 18

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**Question 3:** Consider the natural numbers 88935. Then the least natural number by which we can divide or multiply the number to make it a square number is

a) 3

b) 5

c) 15

d) None of these

**Question 4:** The number of four-digit number greater than or equal to 4321 that can be formed from the digit 0,1,2,3,4,5 allowing for repetition of digits is

a) 360

b) 310

c) 313

d) 311

**Question 5: **42 : 56 : : 72 : ?

a) 96

b) 92

c) 100

d) 51

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__Answers & Solutions:__

**1) Answer (B)**

The series from the right is 24 x 1, 24 x 3, 24 x 5, 24 x 7 and 24 x 9.

For example,

24 x 1 = 24

24 x 3 = 72

24 x 5 = 120

24 x 7 = 168

24 x 9 = 216

So, the wrong number is 163. The correct number is 24 x 7 = 168

**2) Answer (B)**

5p + 4e = 13

9p + 5e = 19

solving for p, we get p = 1

e = 2

So, 6 pencils and 3 erasers cost

6 x 1 + 3 x 2 = 12

**3) Answer (C)**

88935 can be written as 5929 x 15

5929 is the square of 77

So, the answer is 15

**4) Answer (D)**

If the number is in 5 thousands, there are 6x6x6 ways of choosing it.

If the number is in 4 thousands 4 hundreds there are 2x6x6 ways of choosing it.

If the number is in 4 thousand 3 hundreds, there are 3 x 6 + 5 ways of choosing it.

So, total ways = 6x6x6 + 2x6x6 + 3×6 + 5 = 311

**5) Answer (A)**

14 x 3 = 42

14 x 4 = 56

Likewise

24 x 3 = 72

24 x 4 = 96