Math

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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 -

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

  • Math -

    ..or the first one could be the cubes of natural numbers
    1^3, 2^3, 3^3, 4^3, 5^3

  • Math -

    00001, 00011, 00101, ?, 01001
    1,3,5,?,9

    ? = 00111 This is Binary code converted to decimals

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