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If A= (a, b): 4 a=5 b ; a, b 1,2,3, 30 , then the number of such ordered pairs (a, b) is

Options

  1. A4
  2. B6
  3. C8
  4. D10

Correct answer

B. 6

Step-by-step solution

(b) The only possible pairs are: (5,4),(10,8),(15,12),(20,16),(25,20),(30,24)

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