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  • Need explanation for: If a set has 20 elements.How many ordered pairs having distinct elements can be formed?

If a set has 20 elements.How many ordered pairs having distinct elements can be formed?

  • Option 1)

    150

  • Option 2)

    170

  • Option 3)

    190

  • Option 4)

    210

 

Answers (3)

best_answer

As we learnt

 

ORDERED PAIR -

 

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 = 20C_{2}=190

 


Option 1)

150

Option 2)

170

Option 3)

190

Option 4)

210

Posted by

Himanshu

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380 is my ans since ab and ba both are different

Posted by

Abhi Jesus

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380 is my ans since ab and ba both are different

Posted by

Abhi Jesus

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