dse 2013 doubt.

[Aish]

The area of the region bounded by f(x)= x^2+1 and below by g(x)= x-6 on the interval [-1,3] is.

50/3,22,31,100/3
How to do this.

[mrittik]

Integrate -1 to 3 both fns where taken 1st fn -ve & second one +ve

[Aish]

Thanks mrittik.
Please some one help with this one too.
 Q (2007). A class has 6 students ,randomly divided into two teams A and B for a race.What is the probability that the three runners in team A will come in first second and third.
Please help.

[mrittik]

3!*3!/6!....total 6 so 6!, now 3 students comes 1st,2nd&3rd...so total way 3! and similarly for next 3 students for 4th,5th&6th-total way=3!...

[Aish]

Thanks alot Mrittik :)