Question

Look at the series :

3, 7, 24, 11, __, 19, 19,... What number should fill the blank ?
A) 15
B) 13
C) 21
D) 16

Answer 1

Q:

Look at the series :
3, 7, 24, 11, __, 19, 19,...What number should fill the blank ?

A) 15
B) 13
C) 21
D) 16

Answer:   A) 15 

Explanation:

Two series alternate here, with every third number following a different pattern.
In the main series, 4 is added to each number to arrive the next.
In alternate series, 5 is subtracted from each number t arrive the next number.
Here in the main series 
3 + 4 = 7
7 + 4 = 11
11 + 4 = 15
15 + 4 = 19
In alternate series 
24 - 5 = 19
19 - 5 = 14...

Answer 2

Heyy mate ❤✌✌❤

Here's your Answer....

⤵️⤵️⤵️⤵️⤵️⤵️⤵️⤵️

Two series alternate here, with every third number following a different pattern.
In the main series, 4 is added to each number to arrive the next.
In alternate series, 5 is subtracted from each number t arrive the next number.
Here in the main series 
3 + 4 = 7
7 + 4 = 11
11 + 4 = 15
15 + 4 = 19

In alternate series 
24 - 5 = 19
19 - 5 = 14...
✔✔✔