What will be the duplicate ratio of 2 : 7 ?
A4 : 49
B49 : 4
C4 : 14
D8 : 343
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രണ്ടു സംഖ്യകളുടെ തുക 10ഉം ഗുണനഫലം ഇരുപതും ആയാൽ അവയുടെ വ്യുൽക്രമങ്ങളുടെ തുക എത്ര ?
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