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252525/525525*252252/525252
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252525/525525 * 252252/525252
=(25*10101)/(525*1001)*(252*1001)/(52*10101)
=25/525*252/52
=(5*5)/(5*5*21)*(3*4*21)/(4*13)
=3/13
=(25*10101)/(525*1001)*(252*1001)/(52*10101)
=25/525*252/52
=(5*5)/(5*5*21)*(3*4*21)/(4*13)
=3/13
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