13. Which is the factor of the number line below?
n
1
.1
0
.2
.3
.4
.5 .6
.7
.8
.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0
0
1
2
X
=

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