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If relation defined on set A= {1,2,3, . ...

If relation defined on set A= {1,2,3, . . .,50} , and relation `R_1 {(p,p^n) "p is prime &" n ge 0, "n is whole no"}` ,
`R_2 {(p,p^n) "p is prime &" n=0 or 1}` ,
then the number of elements in `R_1-R_2` is

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