Q.91 : यदि a +b +c=1 तथा ab +bc +ca =1/3 हो तो a:b:c होगा ?

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Q.91 : यदि a +b +c=1 तथा ab +bc +ca =1/3 हो तो a:b:c होगा ?
(a) 1:2:4:6
(b) 1:1:1
(c) 7:9:6
(d) 4:5:7

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Answer : 1:1:1