Q: The largest and the shortest distance of the earth from the sun are r1 and r2, its distance from the sun when it is at the perpendicular to the major axis of the orbit drawn from the sun

(a) $\frac{r_1 + r_2}{4}$

(b) $\frac{r_1 r_2}{r_1 + r_2}$

(b) $\frac{2 r_1 r_2}{r_1 + r_2}$

(d) $\frac{r_1 + r_2}{3}$

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Ans: (c)