5. If a,b,c,d are in proportion , then
(a) ac=bd (b) ad = bc (c) ab = cd (d) none of these
6. If a,b,c are in proportion, then
(a) a2 = bc (b) b2 =ac (c) c2 =ab (d) none of these
7. Choose the correct statement
(a) (5:8) > ( 3:4) (b) ( 5:8)< (3:4) (c) two ratios cant be compared
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