P=1 1/3 × 1 1/8 × 1 1/15 ×1 1/24 × 1 1/35 × 1 1/48 × 1 1/63 × 1 1/80 × 1 1/99
P= 4/3 × 9/8 ×16/15 × 25/24 × 36/35 49/48 × 64/63 × 81/80 × 100/99
P= 4 × 9 × 16 ×25 × 36 49 × 64 × 81 × 100/3×9×15× 24 × 35×48×63×80×99
P= 2 × 2 × 3 × 3 × 4 × 4 × 5 × 5 × 6 × 6 × 7 × 7 × 8 × 8 × 9 × 9 × 10 × 10/ 1 × 3 × 2 × 4 × 3 ×5 × 4 × 6 × 5× 7 × 6 × 8 × 7 × 9 × 8 × 10 × 9 × 11
P=(2 × 3 × 4× 5×6×7×8×9×10/1×2×3×4×5×6×7×8×9) × (2 × 3 × 4× 5×6×7×8×9×10/3 × 4 × 5 × 6 × 7 × 8 × 9 × 10 × 11)
P= 10 × 2/11
P= 20/11
