Explanation

The sequence 5, 10, 20, 40, 80, .... is an example of a geometric sequence.

5 + 5 = 10

10 + 10 = 20

20 + 20 = 40 

40 + 40 = 80

The pattern is that we are always multiplying by a fixed number of 2 to the previous term to get to the next term.1

Explanation

Arithmetic sequences

13,15,17,19,21,23,25,27,29,31,33...

ND18-9-2023

Explanation

Table of 19 has a pattern for every ten multiples. Consider the first 10 multiples of 19, i.e. 19, 38, 57, 76, 95, 114, 133, 152, 171 and 190.

ND18-9-2023

Explanation

This series consists of letters in reverse alphabetical order.

QPO NML KJI HGF EDC

Explanation

0.4 is smaller than 0.45, 5, 0.5

Explanation

there is a difference of 3 in every option except the third option in which it is two.

A B C D E F G H I J K L M N O

Explanation

 If FEED is coded as 4332 the DEEF is coded as 2334

solution:

F= 4 

E = 3

E = 3 

D = 2

coded FEED = 4332

Coded DEEF = 2334

Explanation

What is the missing number?

a triangle is a three-sided polygon that consists of three edges and three vertices.

The rectangle is a quadrilateral shape (4-sided shape) 

In geometry, a hexagon is a six-sided polygon

Explanation

ND-6-09-2023

Explanation

Each term in the series is the sum of the preceding two terms

So, the missing term is 51 i.e.