Number in sequence 3,-6,12,4,20 is expanded in the following way
Step-by-step explanation:
There are 2 series clubbed together
Odd place series 3 12 20 ?
Even place series -6 4 ?
These numbers are related in the following way, beginning with 3:
First, we subtract 9 to get -6
3 - 9 = -6
Next, we add 18
-6 + 18 = 12
To get from 12 to 4, we subtract 8:
12 - 8 = 4
and to get from 4 to the final number of 20, we must add 16
4 + 16 = 20
We need to examine the numbers that we add/take away in the sequence to find a pattern so we can predict the next number.
Even place numbers are getting subtracted starting from number 9 and it kept on decreasing for successive odd positions.
Odd place numbers are getting added with twice the number which has been previously subtracted..
hence next number will be
20–7 = 13..
