`(9!-8!)/7!` is equal to

(-9)^(3)-:(-9)^(8) is equal to

If the centroid and two vertices of a triangle are (4,-8),(-9,7),(1,4) and the area of the triangle (in sq.units) is "K" ,then (8)/(333)K is equal to

Evaluate : (1)/((sqrt(9)-sqrt(8))) is equal to

If (x,3)+(2,5)=(7,8) then x is equal to a)2 b)5 c)7 d)9

If (10)^(9)+2(11)^(1)(10)^(8)+3(11)^(2)(10)^(7)+..........+10(11)^(9)=k(10)^(9), then k is equal to:

If (10)^(9)+2(11)^(1)(10)^(8)+3(11)^(2)(10)^(7)+"........"+(10)(11)^(9)=k(10)^(9) , then k is equal to

If R = {{2,a),(3,c),(9,b),(7,a), (8,a), (1,d)} , then R^(-1) is equal to