Use the formula `_nC_r=(n!)/(r!(n-r)!)`
`_12C_5=(12!)/(5!(12-5)!)`
`=(12*11*10*9*8*7!)/(5*4*3*2*1*7!)`
`=(12*11*10*9*8)/(5*4*3*2*1)`
`=792`
Use the formula `_nC_r=(n!)/(r!(n-r)!)`
`_12C_5=(12!)/(5!(12-5)!)`
`=(12*11*10*9*8*7!)/(5*4*3*2*1*7!)`
`=(12*11*10*9*8)/(5*4*3*2*1)`
`=792`
No comments:
Post a Comment