1. Ana, Ben, Carlo, Dan and Emma were sitting on a bench. Find the possible arrangements will be if:
a. there is no restriction
b. the three boys sitting beside each other c. Ana and Carlo refuse to sit beside each other d. they sitting alternately
2. Yuri has 4 different levels of Mathematics books and 7 different books in science. If he planned to arrange them in a shelf, determine the number of ways he can do it,
a. there is no restrictions
b. Math books on the left and science books on the right
c. the books on the same subjects must be kept together

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