सिद्ध कीजिए कि -
`|(.^(x)C_(r),.^(x)C_(r+1),.^(x)C_(r+2)),(.^(y)C_(r),.^(y)C_(r+1),.^(y)C_(r+2)),(.^(z)C_(r),.^(z)C_(r+1),.^(z)C_(r+2))|=|(.^(x)C_(r),.^(x+1)C_(r+1),.^(x+2)C_(r+2)),(.^(y)C_(r),.^(y+1)C_(r+1),.^(y+2)C_(r+2)),(.^(z)C_(r),.^(z+1)C_(r+1),.^(z+2)C_(r+2))|`