Find some clever mathematical formulas, such as Skillfully counting line segments Number of points x number of basic line segments △ 2 This kind of,

Find some clever mathematical formulas, such as Skillfully counting line segments Number of points x number of basic line segments △ 2 This kind of,


1/2×3/4×5/6×7/8…… ×99/100=(1×3×5×7×9…… ×97×99)/(2×4×6×8…… ×98×100)=(2n-1)!/(2n)!=1/2n=1/100
1/100