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In which of the following tables, `a\ a n d\ b` vary directly. Also, find the constant of variation if `a\ a n d\ b` are in direct variation. (i) a: 4, 7, 21, 28 and b:12, 21, 63, 84 (ii) a: 2.5, 5, 7.5, 10, 15 and b:10, 20, 30, 40, 60 (iii) a:1, 2, 3, 4, 5 and b:2, 1, 6, 3, 2/5

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RD SHARMA ENGLISH-DIRECT AND INVERSE VARIATIONS-All Questions
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