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n>1 >>1+2(1X1) = 3
n>2 >>2+2(2X2) = 10
n>3 >>3+2(3X3) = 21
n>4 >>4+2(4X4) = 36
n>5 >>5+2(5X5) = 55
berdasarkan hasil cakaran diatas tdk ada jawaban yang benar
=
misalnya aja, 39=n+
= +n-39=0
a=2,b=1, c=(-39)
dah dimasukkin ke rumusnya
n1=
n2=