In this task, you need to provide the correct option for a given problem from the provided options.

Problem: evaluate 50 ! / 47 ! 
Options: a ) 102500 , b ) 112584 , c ) 117600 , d ) 118450 , e ) 128450
c

Problem: the marks obtained by polly and sandy are in the ratio 5 : 6 and those obtained by sandy and willy are in the ratio of 9 : 7 . the marks obtained by polly and willy are in the ratio of . . . ? 
Options: a ) 9 : 8 , b ) 11 : 10 , c ) 13 : 12 , d ) 15 : 14 , e ) 17 : 16
d

Problem: three numbers are in the ratio of 2 : 3 : 4 and their l . c . m . is 276 . what is their h . c . f . ? 
Options: a ) 18 , b ) 23 , c ) 28 , d ) 32 , e ) 36

b