Let A be a set containing n elements. If...

Let A be a set containing n elements. If the number of elements in the set, `B={(x,y,z):xepsilon A, yepsilon A, zepsilon A and x,y,z` are not all distict) is equal to 280, the n= (A) 8 (B) 10 (C) 20 (D) none of these

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