The number of sides of two regular polygons are in the ratio

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CDS-II 2018 Elementary Math(PYSP)
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MATH

65

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The number of sides of two regular polygons are in the ratio 5 : 4. The difference between their interior angles is 9^o. Consider the following statements :
1) One of them is a pentagon and the other is a rectangle.
2) One of them is a decagon and the other is an octagon.
3) The sum of their exterior angles is 720^o.
Which of the above statements is/are correct?

[CDS-II 2018 Elementary Math(PYSP)]

A 1 only

B 2 only

C 1 and 3

D 2 and 3