JEE Mains Model Paper 25
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Question : 70 of 90
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If a, b, c, d are non-zero real numbers such that (a 2 + b 2 + c 2 ) (b 2 + c 2 + d 2 ) ≤ ( a b + b c + c d ) 2 , then a, b, c, d are in
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