A) 24
B) 78
C) 32
D) 216
E) 72
Correct Answer: E
Solution :
\[\underset{3}{\mathop{\square }}\,\,\,\,\underset{4}{\mathop{\square }}\,\,\,\,\underset{3}{\mathop{\square }}\,\,\,\,\underset{2}{\mathop{\square }}\,\,\,\,\underset{1}{\mathop{\square }}\,\underset{(ways\text{ }to\text{ }filling\text{ }the\text{ }box)}{\mathop{{}}}\,\] \[\therefore \]Required number of positive integer \[=3\times 4\times 3\times 2\times 1\] \[=72\]
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