What comes next in the series? 7, 9, 18, 20, 40, 42, ___?
What comes next in the series? 7, 9, 18, 20, 40, 42, ___?
Explanation
Add 2, then multiply by 2 →
7+2=9
9×2=18
18+2=20
20×2=40
40+2=42
42×2=84
Add 2, then multiply by 2 →
7+2=9
9×2=18
18+2=20
20×2=40
40+2=42
42×2=84