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JAMB Mathematics 2011 Paper
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© africaexams.com
Question : 9
Total: 46
Raial has 7 different posters to be hanged in her bedroom, living room and kitchen. Assuming she has plans to place at least a poster in each of the 3 rooms, how many choices does she have?
49
170
21
210
Validate
Solution:
The first poster has 7 ways to be arranges, the second poster can be arranged in 6 ways and the third poster in 5 ways.
= 7 x 6 x 5
= 210 ways
or
7
P
3
=
7
!
(
7
−
3
)
!
=
7
!
4
!
=
7
×
6
×
5
×
4
!
4
!
= 210 ways
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