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(b_{1}) (b_{2})

এর মধ্যে সম্পর্ক-

r = b_{1} b_{2}

r < \sqrt{b_{1} b_{2}}

r > \sqrt{b_{1} b_{2}}

r = \sqrt{b_{1} b_{2}}

r = b_{1} / b_{2}

ANS : 4

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