Revision

Numeral systems

100

Calculate in binary

10001 + 111=

11000

200

Calculate in binary, then convert to decimal

100111101 * 11 =

1110110111

951

300

Calculate in hexadecimal, then convert to decimal

A2C + 568 = 

F94

3988

Information

100

log₂₅625 = ?

2

200

How many bits of information do we need to describe a 3-digit decimal number?

12

300

How many bits of information do we need to describe a  2-character alphanumeric English string (lowercase + uppercase + digits 0 to 9)?

12

Ciphers

100

Decode Caesar’ cipher, shift 20

yvgikzosk

spacetime

200

Encode using Caesar's chiper, shift 13

WENSDAY

JRAFQNL

300

Encode using Vigenere’ cipher, key MATH

jeopardy

vehwmrwf