Question

Number preceding 10000 base 2

Answer 1

 that's how you count in base 2    :P :

10001 10010 10011  10100 10101 10110 10111 11000 11001 11010 11011 11100 11101 11110 11111  ? see the pattern 

or easier just convert to decimal => decimal to bin

1 * 2^4 + 0 * 2^3  + 0 *2^2  +0 * 2^1 + 0 * 2^0 = 16

after 16 is 17 wow

so

17/2 => (17 can't be divided over 2 without a reminder (8.5) or 1 is reminder)

8   (1) reminder

4   (0) reminder

2 (0)  reminder

1 (0) reminder

0 (1) reminder    (1 /2 = 0.5 not a whole number always ends like that)

collect all reminders:

10001