a+b+c=15 এবং a 2 + b 2 + c 2 = 83 , a b + b c + c a = ক ত ?
a+b+c=15 এবং a 2 + b 2 + c 2 = 83 , a b + b c + c a = ক ত ? a+b+c=15 এবং a 2 + b 2 + c 2 = 83 , a b + b c + c a = ক ত ?a+b+c=15 এবং a 2 + b 2 + c 2
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