Let a- - i-j-k- be a variable vector such that r-i- r-j- and r-k- are positive integers- If r-a- 12 then the number of values of r- is

The correct options are B ^12C_3 C ^12C_9 PROBLEMS BASED ON CERTAIN THEOREMS ON COMBINATIONS : · The number of positive integral solutions of th ...

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Multinomial Expansion

Let a⃗ = i⃗...

Question

Let $\to a = \to i + \to j + \to k,$ be a variable vector such that $\to r . \to i, \to r . \to j$ and $\to r . \to k$ are positive integers. If $\to r . \to a \leq 12$ then the number of values of $\to r$ is

^{12} C_{9} - 1

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^{12} C_{3}

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^{12} C_{9}

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none of these

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