The number of ways in which 10 condidates `A_(1),A_(2),......,A_(10)` can be ranked so that `A_(1)` is always above `A_(2)`, is

The number of ways in which 10 candidates A_(1),A_(2),...A_(10) can be ranked such that A_(1) is always above A_(10) is a.5! b.2(5!) c.10! d.(1)/(2)(10!)

The number of ways in which ten candidates A_(1),A_(2),............A_(10) be ranked such that A_(1) is always above A_(10)

The number of ways in which ten candidates A_1, A_2, ...., A_(10) can be ranked so that A_1 is always above A_2 is

Find the number of ways in which the candidates A_(1),A_(2),A_(3).........,A_(10) can be ranked.

Find the number of ways of seating 10 students A_(1),A_(2).....A_(10) in a way that A_(1),A_(2),A_(3) sit together

Find the number of ways of arranging 15 students A_(1),A_(2),..........A_(15) in a row such that (i) A_(2), must be seated after A_(1) and A_(2) ,must come after A_(2) (ii) neither A_(2) nor A_(3) seated brfore A_(1)

In how many 10 persons A_(1),A_(2),A_(3),....A_(10) can be arranged along row in such a way that A_(2) must always occupy the middle place to that of A_(1),A_(3). (i) 20*8! (ii) 20*7! (iii) 40*7!( iv )2!

In how many ways 10 persons A_(1),A_(2),A_(3),A_(4),...,.,A_(10) can be seated along a row such that A_(2),A_(3),A_(4) sit always after A_(1) is..

a_(1),a_(2),a_(3),......,a_(n), are in A.P such that a_(1)+a_(3)+a_(5)=-12 and a_(1)a_(2)a_(3)=8 then