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U8 = 1/3 × 8 × (8+1) × (8+2)
U8 = 1/3 × 8 × 9 × 10
U8 = 1/3 × 720
U8 = 240
U8 = 1/3.8(8 + 1)(8 + 2)
= 8/3.9.10
= 720/3
= 240