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ABC ত্রিভুজে যদি $∠ A = 75^{\circ}$ এবং $∠ B = 45^{\circ}$ হয়, তবে c:b=?

\sqrt{2} : \sqrt{3}

\sqrt{5} : \sqrt{7}

\sqrt{3} : \sqrt{2}

\sqrt{7} : \sqrt{5}

ANS : 3

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