Question

What is the next number that follows I. The series? 8,24,72,?,648

Answer 1

216
8×3=24
24×3=72
72×3=216
216×3=648

Answer 2

24/8=3

72/24=3

therefore  the next number will be the one which is 3 times 72

= 72*3=216

and to conform it,

216*3=648