instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: for any integer n greater than 1 , n * denotes the product of all the integers from 1 to n , inclusive . how many prime numbers are there between 6 * + 2 and 6 * + 6 , inclusive ?
answer:
none


question:
Problem: the product of two successive numbers is 4160 . which is the smaller of the two numbers ?
answer:
64


question:
Problem: a man swims downstream 42 km and upstream 18 km taking 3 hours each time , what is the speed of the man in still water ?
answer:

1