If `(2a+3b)(2c-3d)=(2a-3b)(2c+3d)` , then `a/b=c/d` (b) `a/d=c/b` (c) `a/b=d/c` (d) `b/a=c/d`

If (a+b+2c+3d)(a-b-2c+3d)=(a-b+2c-3d)(a+b-2c-3d) , then 2b c is equal to 3/2 (b) (3a)/(2d) (c) 3a d (d) a^2d^2

If (a-2b-3c+4d)(a+2b+3c+4d) = (a+2b-3c-4d)(a-2b+3c-4d) then 2ad =

if (2a+3b+4c+5d)/(2a-3b-4c-5d)=(2a-3b+4c-5d)/(2a-3b-4c+5d) , then show that a,3b,2c and 5d are in proportion.

If a+1=b+2=c+3=d+4=a+b+c+d+5, then (a+b+c+d) is equal to

a=2b=3c=4d then a:b:c:d is

If (a)/(b)=(c)/(d) then (a+b)/(a-b)=(c+d)/(c-d),ab=cd ,(a^(2)+b^(2))/(a^(2)-b^(2))=(c^(2)+d^(2))/(c^(2)-d^(2)), ad-dc=0

If [(2a+b,a-2b),(5c-d,4c+3d)]=[(4,-3),(11,24)] , then value of a+b-c +2d is :

If 2a =3b =7c =5d =210 then a +b+c+d is

If [(2a+b, a-2b),(5c-d, 4c+3d)]=[(4,-3),(11,24)] , then value of a + b – c + 2d is: