Posted by **Tina** on Tuesday, December 16, 2008 at 7:56pm.

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**, Tuesday, December 16, 2008 at 8:08pm
the second one is odd numbers.

the first one is I think powers of two, and the 125 should be 128.

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**Reiny**, Tuesday, December 16, 2008 at 8:15pm
..or the first one could be the cubes of natural numbers

1^3, 2^3, 3^3, 4^3, 5^3

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**CC**, Friday, December 19, 2008 at 12:39am
00001, 00011, 00101, ?, 01001

1,3,5,?,9

? = 00111 This is Binary code converted to decimals

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