The binary number 11011001 relates in decimal to the number 221.
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In HEX, 1101 1001 is D9. Translated to decimal, that equals 217.
1101 is the binary equivalent of the decimal number 13
9: 1001 10: 1010 11: 1011 12: 1100 13: 1101 14: 1110 15: 1111 16: 10000
Binary 1101 = D
1101 = 8 + 4 + 1 = 13 (base 10).