CBSE Class 12-science Answered
Combinations
Asked by | 01 Dec, 2009, 12:36: PM
Expert Answer
If he borrows chemistry I then for the remaining two books out of 7 = 7C2 = 7!/(2!5!) = 21 ways
and if he don't borrow chemistry I then, he'll not borrow chemistry II,
The combinations are 6C3 = 6!/(3!3!) = 20
Total 41 different ways he can borrow three books.
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Team,
TopperLearning.
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