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When a group photograph is taken, all the seven teachers should be in the first row and all the twenty students be in the second row. If the two corners of the second row are reserved for the two tallest students, interchangeable only between them, and if the middle seat of the front row is reserved for the principal; the number of such possible arrangements is

A
$$720 \times 18!$$
B
$$1440 \times 18!$$
C
$$1370 \times 18!$$
D
None of these
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Solution
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Correct option is B. $$1440 \times 18!$$

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