[tex]\frac{20!}{13!*7!} * \frac{15!}{9!*6!} = \frac{10*11*12*13*14*15*14*15*16*17*18*19*20}{2*3*4*5*6*7*2*3*4*5*6} = 387987600[/tex]
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[tex]\frac{20!}{13!*7!} * \frac{15!}{9!*6!} = \frac{10*11*12*13*14*15*14*15*16*17*18*19*20}{2*3*4*5*6*7*2*3*4*5*6} = 387987600[/tex]