B. 51 / 51
Explanation(x - 1/x)² = x² - 2 + 1/x² so x² + 1/x² = 49 + 2 = 51.
(x - 1/x)² = x² - 2 + 1/x² इसलिए x² + 1/x² = 49 + 2 = 51।
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