Let $A$ be a set of $n (\geq 3)$ distance elements. The number of triplets $(x, y, z)$ of the $A$ elements in which at least two coordinates is equal to a. $^{n} P_{3}$ b. $n^{3} -^{n} P_{3}$ c. $3 n^{2} - 2 n$ d. $3 n^{2} - (n - 1)$

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Let

A

be a set of

n (\geq 3)

distance elements. The number of triplets

(x, y, z)

of the

A

elements in which at least two coordinates is equal to a.

^{n} P_{3}

n^{3} -^{n} P_{3}

3 n^{2} - 2 n

3 n^{2} - (n - 1)

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Question Text

Let

A

be a set of

n (\geq 3)

distance elements. The number of triplets

(x, y, z)

of the

A

elements in which at least two coordinates is equal to a.

^{n} P_{3}

n^{3} -^{n} P_{3}

3 n^{2} - 2 n

3 n^{2} - (n - 1)

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