You break your piggy-bank to discover lots of pennies and nickels. You start arranging these in rows of 6 coins.

- You find yourself making rows containing an equal number of pennies and nickels. For fun, you decide to lay out every possible such row. How many coins will you need?
- How many coins would you need to make all possible rows of 6 coins (not necessarily with equal number of pennies and nickels)?