instruction:
In this task, you need to provide the correct option for a given problem from the provided options.
question:
Problem: what is the greatest positive integer r such that 3 ^ r is a factor of 9 ^ 10 ? 
Options: a ) r = 5 , b ) r = 9 , c ) r = 10 , d ) r = 20 , e ) 30
answer:
d


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


question:
Problem: what is the square root of 169 ? 
Options: a ) 8 , b ) 16 , c ) 13 , d ) 42 , e ) 25
answer:

c