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Let A be a set of n(ge 3) distinct eleme...

Let A be a set of `n(ge 3)` distinct elements. The number of triplets (x, y, z) of the elements of A in which ar least two coordinates are equal is

A

`.^nP_3`

B

`n^3` - `.^nP_3`

C

`3n^2 - 2n`

D

`3n^2(n - 1)`

Text Solution

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The correct Answer is:
C
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