2+2+2+2+2+2+2+1
or
1+1+1+1+1+1+1+1+1+1+1+1+1+1+1
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Simple: 1*1*1*1*1*15 = 15
One way is: 1+15+8 = 10
you can make them all using 1, 1-1=0 1=1 1+1=2 1+1+1=3 etc.
0!=1 =(0! + 0! + 0! + 0! + 0!)! =(1 + 1 + 1 + 1 + 1)! =(5)! =120.
The system of numbering using only 0 and 1 is called binary. In decimal moving right to left each column is 10 times greater than the last. So 1345 = 1000+300+40+5 In binary moving right to left each column is twice as large. Below you will see some examples. 8 4 2 1 0 0 0 1 = 1 0 0 1 0 = 2 0 0 1 1 = 3 0 1 0 0 = 4 0 1 0 1 = 5 1 0 0 1 = 9 1 1 1 1 = 15