If a, b, c and d are four positive real numbers such that abcd = 1, what is the minimum value of (1 + a)(1 + b)(1 + c)(1 + d)?
Explanation:
This is possible when, a = b = c = d = 1
∵ a, b, c, d are positive real numbers
∴ (1 + a)(1 + b)(1 + c)(1 + d) = 2 × 2 × 2 × 2 = 16
Hence, option (c).
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