SOLUTION: 3, 9, 24, ?

Algebra ->  Sequences-and-series -> SOLUTION: 3, 9, 24, ?      Log On


   

Question 959047: 3, 9, 24, ?
Answer by Edwin McCravy(20056) About Me  (Show Source):
You can put this solution on YOUR website!
Find the 1st and 2nd differences by subtracting each number
from the one below it and writing the difference by that
number:

 3   6   9 
 9  15   
24  

Put another 9 under the 9 in the 2nd differences
and work your way back to the first column by adding:

 3   6   9 
 9  15   9   
24  24
48

Answer: 48

Edwin