If \( x+y=8 \) then the maximum value of \( x y \) is- (a) 8 (b) 16 (c) 20 (d) 24

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If \( x+y=8 \) then the maximum value of \( x y \) is-
(a) 8
(b) 16
(c) 20
(d) 24
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