1.

|(.^(x)C_(r),.^(x)C_(r+1),.^(y)C_(r+2)),(.^(y)C_(r),.^(x)C_(r+1),.^(y)C_(r+2)),(.^(z)C_(r),.^(z)C_(r+1),.^(z)C_(r+2))|+|(.^(x)C_(4),.^(x+1)C_(r+1),.^(x+2)C_(r+2)),(.^(y)C_(4),.^(y+1)C_(r+1),.^(y+2)C_(r+2)),(.^(z)C_(4),.^(z+1)C_(r+1),.^(z+2)C_(r+2))|=

Answer»

0
`2^(n)`
`.^(x+y+z)C_(r)`
`.^(x+y+z)C_(r+2)`

ANSWER :A


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