A) 1
B) 3
C) 5
D) 7
Correct Answer: D
Solution :
\[\frac{^{n}{{P}_{r}}}{^{n}{{C}_{r}}}=24\Rightarrow r\ !=24\Rightarrow r=4\] \[\therefore \]\[^{n}{{C}_{4}}=35\Rightarrow n=7\].
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