A) 420
B) 840
C) 2520
D) 5040
Correct Answer: A
Solution :
Required number = \[\frac{7\ !}{3\ !\ 2\ !}=\frac{5040}{6\times 2}=420\]. (\[\because \] 3 is repeated thrice and 2 is repeated twice).You need to login to perform this action.
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