Posted by Tina on .
These sets of numbers all follow logical patterns. Which numbers replace the question marks?
( 1, 8, ?, 64, 125 )
( 00001, 00011, 00101, ?, 01001 )
( 17,23,?,18,20,25,21,9,15,16 )

Math 
bobpursley,
the second one is odd numbers.
the first one is I think powers of two, and the 125 should be 128. 
Math 
Reiny,
..or the first one could be the cubes of natural numbers
1^3, 2^3, 3^3, 4^3, 5^3 
Math 
CC,
00001, 00011, 00101, ?, 01001
1,3,5,?,9
? = 00111 This is Binary code converted to decimals