There are 8 books in a shelf that consist of 2 paperback books and 6 hardback books. If 4 books are selected at random without r
eplacement, how many different combinations are there that at least one paperback book is selected?A. 40B. 45C. 50D. 55E. 60
1 answer:
Answer:D
Step-by-step explanation:
This is combination.
If 4 books selected out of eight book in the shelf:
(4 combination 8)= 70
For hardback selection:
Then selection of 4 books out of the hardback, it means there is no paperbach will be:
(4 combination 6)= 15
So , if at least one paperback selected will be : 70-15
That is 55
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