Hey guys... I've been doing logic questions all day and I'm stuck on this last one. Please lend me a hand and give me some help... :)

How many ways are there to pick a collection of 11 coins from piles of pennies, nickels, dime, and quarters? Base on the following condition:

a) Assuming that each pile has at least 11 coins.

I think this is....C(44,11)=7669339132

b) There are only 10 coins in each pile

Thanks in advance for your help!