self Maths Puzzle

in how many ways 6childrens be seated on 6chairs

Read Solution (Total 3)

6! ways
suppose we have 6 chairs A,B,c,D,R,F. 1st child sits on chair A. Fix 1st child on A. Now , 2nd, 3rd, 4th, 5th and 6th child can sit on chairs B,C,D,E,F.
Again fix 1st chiled on A and keep changing the chairs of remaining children. This will result in 5! ways.
Now, 1st child can be fix in this way on all the six chairs.
so 6*5!=6!=720 ways
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6!
Since any of the 6 child can be seated in 1st chair, in 2nd anyone of the 5 children and so on...
so the arrangements can be done as
6*5*4*3*2*1= 6!
720 ways
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ans:720
6!=6*5*4*3*2*1
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self Other Question

if x^2+1=x
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