In the expansion of (1+x)n(1+y)n(1+z)n, the sum of coefficients of th – InterviewSolution

1.	In the expansion of (1+x)n(1+y)n(1+z)n, the sum of coefficients of the terms of degree 'r' is
Answer» In the expansion of $(1 + x)^{n} (1 + y)^{n} (1 + z)^{n}$ , the sum of coefficients of the terms of degree 'r' is

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