A) \[\frac{n+r-1}{r}\]
B) \[^{5}{{P}_{2}}\]
C) \[^{4}{{P}_{2}}\]
D) \[^{6}{{P}_{3}}\]
Correct Answer: C
Solution :
To be divisible by 5, the digit 5 must be at unit place, so now to be between 3000 and 4000, 3 must be at thousand place. Hence the required number of ways\[={{\,}^{4}}{{P}_{2}}\].
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