Any of the ten digits 0 through 9 may be used in a 6-digit code, but no digit may be used more than once. If the first two digits are 1 and 7, what is the largest possible average of all 6 digits?

Question

a)4 b)6 c)6.5 d) 7

Answer 1

b)6

for largest possible average u add on highest numbers u can: next highest numbers would be 9, 8, 6, and 5
1+7+9+8+6+5=36
36/6=6

Answer 2

The number is something like this.

1 7 9 8 6 5

Add them together and divide by 6 to find the average.