Question

Complete the series
13, 3, 11, 6, 9, 9, 7, 12 .......

Options:
(1) 5, 24
(2) 5, 15
(3) 3, 17
(4) 3, 18

Answer 1

Answer:

Option (2) - 5,15.

Explanation:

Given 13,3,11,6,9,9,7,12....


Condition 1:

Let's consider the numbers which are in the odd places.

13,11,9,7.

13 - 11 = 2

11 - 9 = 2

9 - 7 = 2

The next number will be 7 - 2 = 5.


Condition 2:

Let's consider the numbers which are in the even places. 

3,6,9,12.

3 * 2 = 6

3 * 3 = 9

3 * 4 = 12

Therefore the next number will be 3 * 5 =15.


(or) 

3 + 3 = 6

6 + 3 = 9

9 + 3 = 12

The next number in the sequence will be 12 + 3 = 15.


Therefore the next number in the sequence will be 5,15.


Hope this helps!

Answer 2

13 ,11,9,7,5
3,6,9,12,15