यदि `ab=21` और `((a+b)^(2))/((a-b)^(2))=25/4` हो तो `a^(2)+b^(2)+3ab` का मान क्या होगा?

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यदि a + b = 10 व ab = 21, तब `a^(3) + b^(3)` का मान ज्ञात कीजिए ।

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