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maka 1/20! - 1/21! + 1/22! =
1/20*19*18*17*16*15*14*13*12*11*10*9*8*7*6*5*4**3*2*1 - 1/21*20*19*18*17*16*15*14*13*12*11*10*9*8*7*6*5*4*3*2*1 + 1/22*21*20*19*18*17*16*15*14*13*12*11*10*9*8*7*6*5*4*3*2*1
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Hasilnya adalah =442/22!