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Un = 3/2 n^2 + 3/2n
maka U7 = 3/2 (7)^2 + 3/2 (7) - 2
= 147/2 + 21/2
= 168/2
= 84
jadi pola yg ke 7 = U7 memerlukan 84 batang korek api (opsinya C)