Two variants of the CAT paper are to be given to 12 students. In how many ways can the students be placed in two rows of six each so that there should be no identical variants side by side and that the students sitting one behind the other should have the same variant. Find the number of ways this can be done
2 x ^{12}C_{6} x (6!)^{2}
2 x 6! x 6!
2 x ^{12}C_{6} x 6!
None of these
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