Jambmaths question:
Raila 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?
Option A:
21
Option B:
210
Option C:
170
Option D:
49
Jamb Maths Solution:
$^{7}{{P}_{3}}=\frac{7!}{(7-3)!}=\frac{7\times 6\times 5\times 4!}{4!}=210\text{ ways}$
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