. यदि a, b, c,d चार अऋणात्मक वास्तविक संख्याएँ हो और a+b+
c+d= 1 हो तोab+bc+ cd + da का अधिकतम मान क्या होगा।
(A)3 (B) 1
(C)1/2
(D)1/4
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