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### Section 1.3.1′

1. #7d9 or #7D9.

2. (a) {B,D,F,b,d,f}. (b) {A,C,E,a,c,e}. An odd fact of life.

3. (Solution by Gregor N. Purdy.) 2 bits = 1 nyp; 2 nyps = 1 nybble; 2 nybbles = 1 byte. Incidentally, the word “byte” was coined in 1956 by members of IBM’s Stretch computer project; see W. Buchholz, BYTE 2, 2 (February 1977), 144.

4. 1000 MB = 1 gigabyte (GB), 1000 GB = 1 terabyte (TB), 1000 TB = 1 petabyte (PB), 1000 PB = 1 exabyte (EB), 1000 EB = 1 zettabyte (ZB), 1000 ZB = 1 yottabyte (YB), according to the 19th Conférence Générale des Poids et Mesures (1990).

(Some people, however, use 210 instead of 1000 in these formulas, claiming for example that a kilobyte is 1024 bytes. To resolve the ambiguity, such units should preferably ...

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