1001
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9 (base 10) = 1001 (base 2)
9
Binary is base 2, using the digits 0 and 1. Decimal system is base 10 with 0-9.
Assuming the 00001001 is supposed to be in binary, the decimal equivalent is 9.
9: 1001 10: 1010 11: 1011 12: 1100 13: 1101 14: 1110 15: 1111 16: 10000