There are 4 identical pens and 7 identical books. In how many ways can a person select at least one object from this set?
Select the correct option.
A) 11  B) 12  C) 39  D) (2^4 - 1)(2^7 -1)  E) 2^11 - 1
7 items can be chosen in 8 ways- 0,1,2..7 at a time   similarly 4 items can be chosen way will be 5- choosing 0, choosing 1.. choosing 4   total ways = 8*5=40..   But we are looking for AT LEAST 1, so subtract 1 way when both are 0..   ans  40-1= 
<gadget id="calculator"> 40-1</gadget>
<output>39</output>
39.   ANSWER:39
<result>C</result>
There are 4 identical pens and 7 identical books. In how many ways can a person select at least one object from this set?