1.

If a + b + c + d = 2, then the maximum value of (1 + a) (1 + b) (1 + c) (1 + d) is _______.

A. \(\frac{{91}}{9}\)
B. \(\frac{{81}}{16}\)
C. \(\frac{{63}}{22}\)
D. \(\frac{{54}}{13}\)
Answer» C. \(\frac{{63}}{22}\)


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