Question

What is ? In the following series? 3, -6, 12, 4, 20, ?

Answer 1

Answer:

13

Step-by-step explanation:

3-9=-6       -9        

-6+18=12   +18

12-8=4       -8

4+16=20   +16

20-7=13    -7

              +14

               -6  

             +12