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Observe the number table and fill in the "mouth" in the number table
one
1 -1
1 -2 1
1 -3 3 -1
1 -4 6 -4 1
1-5 port-10 5-1
1-6 ports-20 15-6 1
Why? Why do you fill in this way?
Observe the number table and fill in the "mouth" in the number table
one
1 -1
1 -2 1
1 -3 3 -1
1 -4 6 -4 1
1-5 port-10 5-1
1-6 ports-20 15-6 1
Why? Why do you fill in this way?
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