If a set has 20 elements.How many ordered pairs having distinct elements can be formed? A. 150 B. 170 C. 190 D. 210

Answers (1)

A pair of elements grouped together in a particular order.

- wherein

eg. (a,b), a\epsilon A \and\ b\epsilon B

 The number of ordered pairs = ^{20}C_{2}=190

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