how to use matchsticks to derive general formula?
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Step-by-step explanation:
n matchstick count formula
1 horizontal: 2 matches in each of 3 rows vertical: same as horizontal 12n
2 horizontal: 3 matches in each of 4 rows vertical: same as horizontal 12n
3 horizontal: 4 matches in each of 4 rows plus 2 extras vertical: same as horizontal 12n
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