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Let A be a set of n(geq3) distance el...

Let `A` be a set of `n(geq3)` 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. `3n^2-2n` d. `3n^2-(n-1)`

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