There are 8 books on a shelf, of which 2 are paperbacks and 6 are hardbacks. how many possible selections of 4 books form this shelf include at least 1 paperback book?
Created: 6 years ago |
Updated: 2 years ago
best des
Selections of 4 books out of 8: 8C4 = 70;
Selections of 4 hardback books out of 6 (so none paperback):
6C4 = 15;
At least One paperback = {total} - {none} = 70 - 15 = 55. (ans)
Md Azizur Rahman
Founder of Satt
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