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 = 7257600Related Questions on Permutation and Combination
A. 3! 4! 8! 4!
B. 3! 8!
C. 4! 4!
D. 8! 4! 4!
A. 7560,60,1680
B. 7890,120,650
C. 7650,200,4444
D. None of these
A. 8 × 9!
B. 8 × 8!
C. 7 × 9!
D. 9 × 8!
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