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If $A=\{(a, b): 4 a=5 b ; a, b \in\{1,2,3, \ldots 30\}\}$, then the number of such ordered pairs $(a, b)$ is
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The correct answer is:
6
(b) The only possible pairs are:
$(5,4),(10,8),(15,12),(20,16),(25,20),(30,24)$
$(5,4),(10,8),(15,12),(20,16),(25,20),(30,24)$
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