A) less than 500
B) at least 500 but less than 750
C) at least 750 but less than 1000
D) at least 1000
Correct Answer: D
Solution :
\[{{N}_{1}}{{N}_{2}}{{N}_{3}}{{N}_{6}},{{D}_{1}}{{D}_{2}}{{D}_{3}}\] The number of ways\[=6{{c}_{4}}\times 3{{c}_{1}}\times 24\] \[=15\times 3\times 24=1080\]
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