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[thirumoorthi]

90 reason
3×3-3=6
7×7-7=49
9×9-9=72
10×10-10=90

[junioralmeidaresende-fpkt]

Take n for the rang of a serie Un
Where : Un = n^2-n
U3 = 3×3-3 = 6
U7 = 7×7-7 = 42
U9 = 9×9-9 = 72
U10 = 10×10-10 = 90