3. stick and dot method seperately for each candy. 11C3 * 10C3 = 19800
4. stick and dot method for each case of the twins having a certain number.
0 each = 8C2
1 each = 6C2
2 each = 4C2
3 each = 2C2
Add them and you get 50.
reply if you want a more detailed explanation