two cards are drawn together from a pack of 52 cards . the probability that one is a spade and one is a heart , is :
"n ( s ) = ( 52 x 51 ) / ( 2 x 1 ) = 1326 . let e = event of getting 1 spade and 1 heart . n ( e ) = number of ways of choosing 1 spade out of 13 and 1 heart out of 13 = ( 13 x 13 ) = 169 . p ( e ) = n ( e ) / n ( s ) 169 / 1326 = 13 / 102 answer e"
multiply(divide(multiply(divide(52, const_4), divide(52, const_4)), multiply(52, 52)), const_2)