Bunuel wrote:
There are 4 identical pens and 7 identical books. In how many ways can a person select at least one object from this set?
A. 11
B. 12
C. 39
D. (2^4 - 1)(2^7 -1)
E. 2^11 - 1
11c2 - 4c1-7c1 = 39
i.e total ways-selecting none of each pair
There are 4 identical pens and 7 identical books. In how many ways can a person select at least one object from this set?
A. 11
B. 12
C. 39
D. (2^4 - 1)(2^7 -1)
E. 2^11 - 1
11c2 - 4c1-7c1 = 39
i.e total ways-selecting none of each pair
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