The binary representations of the decimal numbers from 20 to 30 are as follows:
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There are two prime numbers between 20 and 30 which are 23 and 29
The composite numbers between 20 and 30 are: 20 21 22 24 25 26 27 28 30
The only numbers used in binary are 0 and 1
5 multiplied by 2 is 10Answer:Consider the joke: There are 10 kinds of people in the world those who understand binary and those that don't.Binary uses powers of 2 to express numbers. Thus 20=1,21=2, 22=4 and so on (numbers shown in decimal). This is expressed as strings of numbers using either 0 or 1. Thus 0(binary) =0 (deciamal). 1(Binary)=1 (decimal) or 20, 10(binary)=2(decimal) or 21, 11=3 (decimal) =10+1(binary) = 21+20 and so on.
20