There are 6 identical pens and 9 identical books. In how many different ways can a person select at least one object from this set?	Choose the correct choice from the following answers:
A) 15 B) 30 C) 69 D) 78 E) 90
We can select from 0 to 6 pens and from 0 to 9 books.   Thus the total possible ways to select objects is   7*10= 
<gadget id="calculator">  7*10</gadget>
<output>70</output>
70   We must subtract 1 for the case with 0 pens and 0 books.   The answer is 69.
<result>C</result>
There are 6 identical pens and 9 identical books. In how many different ways can a person select at least one object from this set?