15 = 1111
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111111 in binary is 255 in decimal which is FF in hexadecimal (i.e. 15 units and 15 16s)
1111 in binary is 15 in decimal. 1111 in decimal is 10001010111‬ in binary.
9: 1001 10: 1010 11: 1011 12: 1100 13: 1101 14: 1110 15: 1111 16: 10000
Assuming you start from 0, you need at least 4 bits. 15 in binary: 15 = 8 + 4 + 2 + 1 = 1111₂
15 = 1111 14 = 1110 13 = 1101