Answer:
It can be made 66 combinations.
Explanation:
Total amount of possibilities= 10×5¢+10×2¢=70¢
The first combination 1¢ cannot be made because 2¢ is not divisible.
The second combination is 2¢. (Possible)
The third combination 3¢ cannot be made for the same reason.
There are no possible combinations for 1¢ and 3¢.
The same happens with 67 and 69.
For example:
66¢= 10×5¢+8×2¢
Next combination will be:
68¢= 10×5¢+9×2¢
And finally:
70¢= 10×5¢+10×2¢
So there are 4 combinations that are not possible.
The total amount of possible combinations are:
70-4=66 combinations
