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B 3 8 D E n=7P1=10 n=7P1=10 F=3×7-2×10=1 F=3×7-2×10=1n = 7 Pl = 10 F = 3×7–2×10 = 1 B C D E 2 1 3 4 5 6 7 8 A n =7 Pl = 10 F = 3×7–2×10 = 1
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