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Question

# If A={5,7,9,11},B={9,10} and aRb means a<b where a∈A,b∈B, then which of the following is true?

A
Range of R= Co-domain of R
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B
Range of R Co-domain of R
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C
Domain = {5, 7}
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D
None of the above
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Solution

## The correct option is A Range of R= Co-domain of RGiven that R is a relation such that aRb mean a<b. ⇒R={(5,9),(5,10),(7,9),(7,10),(9,10)} ⇒Domain={5,7,9}, the set of all first coordinates of the ordered pairs that belong to R Also, co-domain ={9,10}, the second set in the relation R Range ={9,10}, the set of second components of the ordered pairs which belong to R

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