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If R be a relation lt from A ={ 1,2,3,4...

If R be a relation `lt` from A ={ 1,2,3,4 } to B = { 1,3,5} i.e (a,b ) `in` R iff a `lt` b then `R^(-1)` is { (3,1), (k,1), (3,2), (k,2), (k,3), (k,4) } what will be the value of k ?

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