10 students are to be seated in two rows equally for the Mock test in a room. There are two sets of papers, Code A and Code B. each of two rows can have only one set of paper but different that from other row. In how many ways these students can be arranged ?
A. 2775600
B. 125600
C. 7257600
D. 1200560
E. None of these
Answer: Option C
Solution (By Examveda Team)
5 students can be seated out of 10 students in 10C5 ways Remaining 5 will be seated in, = 5C5 ways Students of each row can be arranged as, = 5! × 5! ways Two sets of paper can be arranged themselves in, = 2! ways Thus, Total arrangement, = 10C5 × 5! × 5! × 2 = 7257600This Question Belongs to Arithmetic Ability >> Permutation And Combination
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