we have to place 8 persons in a 1) straight bench 2) round arrangement. Difference of the number of

M4maths Previous Puzzles

16 Jun 2011 straight and round

we have to place 8 persons in a 1) straight bench 2) round arrangement.
Difference of the number of methods will be

OPtion

1) 5040
2) 7580
3) 10480
4) 18240
5) 26720
6) 35280
7) 40320
8) 48350
9) 56480
10) none of these

Solution

in straight arrangement total methods = 8*7*6*5*4*3*2*1 = 40320
in round arrangement total methods = 1*7*6*5*4*3*2*1 = 5040
so difference will be 40320 - 5040 = 35280

Correct Option: 6 Best Solution (4)