Minimum Value

Algebra Level 2

(1+a)(1+b)(1+c)(1+d) \large (1 + a)(1 + b)(1 + c)(1 + d)

If a,b,ca,b,c and dd are four positive real numbers such that a×b×c×d=1a\times b\times c\times d = 1, then find the minimum value of the expression above.

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