A) 4920
B) 3720
C) 3600
D) 4800
Correct Answer: B
Solution :
Total number of words formed without any restriction\[=7!\] Total number of words beginning with\[I=6!\] Total number of words beginning with\[B=6!\] Total number of words beginning with \[I\] and ends with\[B=5!\] \[\therefore \]Required number of words\[=7!\,-6!\,-6!\,+5!\] \[=5040-2\times 720+120=3720\]You need to login to perform this action.
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