Chapter 4.2, Problem 9MC

To determine

(a)

To explain:

That $3\cdot 5\cdot 7\cdot 11\cdot 13$ is composite.

To determine

(b)

To explain:

That $\left(3\cdot 4\cdot 5\cdot 6\cdot 7\cdot 8\right)+2$ is composite.

To determine

(c)

To explain:

That $\left(3\cdot 5\cdot 7\cdot 11\cdot 13\right)+5$ is composite.

To determine

(d)

To explain:

That $10!+7$ is composite.