Discussion

Explanation:

We know, AM ≥ GM [equality occurs when the numbers are equal]

∴ For two numbers, x and y

⇒ $\frac{x+y}{2}$ ≥ $\sqrt{xy}$

⇒ x + y ≥ 2 × √16

⇒ x + y ≥ 8

∴ Least possible value of (x + y) is 8. [This happen when x = y = 4.]

Note: When product of two numbers is constant, their sum is least possible when the two numbers are equal (or as close to each other as possible).

Hence, option (c).

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