1.

Which of the following is true ?A. 2,5,7,10 are in proportion.B. 4:3 : : 8 : 6C. if a : b : c :d , then b : c x isD. None of the above

Answer» Correct Answer - B
(a) 2, 5 , 7 , 10
` 2 xx 10 = 20`
` 5 xx 7 = 35`
` 2 xx 10 ne 5xx 7`
(b) 4 : 3 : : 8:6
` Rightarrow 4/3 = 8/6` ( true)
(c) a, b,c ,d are in proportion.
` Rightarrow a/b = c/d Rightarrow bc = ad`
` b/c` need not be equal to `d/a`
Hence, the correct option is (b)


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