In the expansion of (1 + x)^{n} (1 + y)^{n} (1 + z)^{n}, the sum of the co-efficients of the terms of degree 'r' is

- a)
- b)
- c)
- d)

Correct answer is option 'C'. Can you explain this answer?

Related Test: Test: Binomial Numbers (Competition Level) - 1

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