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Byju's Answer
Standard XII
Mathematics
Combination
There are 1...
Question
There are
10
different books in a shelf. Find the number of ways in which
3
books can be selected so that exactly two of them are consecutive.
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Solution
10
books in a shelf
Select
3
books such that exactly two are
Consecutive Total possibilities Total possibilities(Trends)
Number of ways
=
6
×
7
+
7
×
2
=
56
No.of books No of books
from which from which
3
r
d
book
3
r
d
book
is selected is selected
when other two when other two
books are in books are in
middle either end
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