If `x/(y+z)=a ;\ y/(z+x)=b` and `z/(x+y)=c` , then `1/(1+a)+1/(1+b)+1/(1+c)` is equal to (a) 2 (b) 3 (c) 6 (d) `x+y+z`

If (x)/(y+z)=a;backslash(y)/(z+x)=b and (z)/(x+y)=c then (1)/(1+a)+(1)/(1+b)+(1)/(1+c) is equal to (a) 2( b) 3(c)6(d)x+y+z

If (a)/(x)+(y)/(b)=1 and (b)/(y)+(z)/(c)=1, then (x)/(a)+(c)/(z) will be equal to: (a) 0 (b) (b)/(y) (c) 1 (d) (y)/(b)

If (b)/(y) + (z)/(c) = 1 and (c)/(z) + (x)/(a) = 1 , then what is (ab + xy)/(b x) equal to ?

If ( x - 1 )^3 + ( y - 2 )^3 + ( z - 3 )^3 = 3 ( x - 1 ) ( y - 2 ) ( z - 3 ) and x - 1 != y -2 != z-3 , then x + y + z is equal to : ( A ) 2 ( B ) -6 ( C ) 6 ( D ) 4

If a^(x)=b^(y)=c^(z)andabc=1 , then the value of 1/(x)+1/(y)+1/(z) will be equal to

If x=5,y=3 and z=2, then (x(y-z))/(y(x+y+z))=?( a) (1)/(6)(b)(1)/(30) (c) 1 (d) 5

If cot^(-1)x+cot^(-1)y+cot^(-1)z=pi/2,x , y , z >0a n dx y<1, then x+y+z is also equal to (a) 1/x+1/y+1/z (b) x y z (c) xy+yz+zx (d) none of these