: because


No Study = Fail ....................... ( I )


Study = No Fail ...................... ( II )



By Combining ( I ) & ( II ) :



=====> ( No Study + Study ) = ( No Fail + Fail )



By Taking ( Study ) as a common factor in the left hand side



And Taking ( Fail ) as a common factor in the right hand side



=====> Study ( No + 1) = Fail (No + 1 )



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By Dividing both sides by ( No + 1)



=====> study=fail__________________