The combination of a lock uses numbers 1-10 Each number is only used once and it is a 3 number code.

What is the probability that you will get the combination correct on the first try?
a
1/6
b
3/80
c
1/720
d
1/1000

Frank has a devised a formula for his catering business that calculates the number of meatballs he needs to prepare. the formula is m=4a+2c, where c=number of children; m=number of meatballs; a=number of adults. how many meatballs are required for a party of 10 adults and 5 children?