If `A : B = 7: 9` and `B : C = 6 : 7`, then `A : C` is equal to

(a) If A : B = 3 : 4 and B : C = 6 : 7 , find : (i) A : B : C (ii) A : C (b) If A : B = 2 : 5 and A : C = 3 : 4 , find : A : B : C .

Let A = {2, 5, 7,9} and B = {a, b, c}, then n(A xx B) is equal to

If a : b = 3 : 5 and b : c = 4 : 7 , find a : b : c

If A:B = 2:7 and B:C = 9:13, find A:C.

In a triangle A B C , if a : b : c=3:7:8,t h e n R : r is equal to a. 2:7 b. 7:2 c. 3:7 d. 7:3

In Delta ABC of a :b:c= 7 : 8: 9 .Then cos A : cos B is equal to :-

If a: b= 2: 3, b: c= 4: 5 and c: d= 6: 7 , find : a: b: c:d .

If A = {3, 5, 7, 9} and B = {a, b, c}, then which of the following are relations from A to B ? Give reasons for your answer. (i) R_(1) = {(3, a), (5, b), (5, c)} (ii) R_(2) = {(3, c), (9, b), (5, a)} (iii) R_(3) = {(3, c), (b, c), (7, b), (9, a)} (iv) R_(4) = {(3, b), (7, c), (c, a), (b, 9)}

if 4A+ 5B + 9C = 36 and 7A + 9B + 17C = 66 then, find A+B+C.

In a triangle A B C , if a : b : c=4:5:6 , then ratio between its circumradius and inradius is (a) (16)/7 (b) (16)/9 (c) 7/(16) (d) (11)/7