Question

What is the third missing term in the series?
15) 1.3, 2.6, 5.2, 10.4,

Answer 1

Answer: 20.8

The reason is because:

1.3+1.3=2.6

2.6+2.6=5.2

5.2+5.2=10.4

And... 10.4+10.4=20.8

Answer 2

the answer is 20.8 :)