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CAT 2003 Question Paper (Leaked) Question 86
Question 86

If the product of n positive real numbers is unity, then their sum is necessarily

Solution

Let the numbers be $$a_1,a_2....a_n.$$

Since the numbers are positive,

$$AM\geq GM$$

$$\frac{a_1+a_2+a_3....+a_n}{n}\geq (a_1*a_2....*a_n)^{1/n}$$

$$a_1+a_2+a_3....+a_n \geq n$$



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