1

### IIT-JEE 1980

Subjective
The interior angles of a polygon are in arithmetic progression. The smallest angle is $${120^ \circ }$$, and the common difference is $${5^ \circ }$$, Find the number of sides of the polygon.

9
2

### IIT-JEE 1979

Subjective
The harmonic mean of two numbers is 4.Their arithmetic mean $$A$$ and the geometric mean $$G$$ satisfy the relation. $$2A + {G^2} = 27$$

$$3$$ and $$6$$ or $$6$$ and $$3$$

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