Correct Answer: Option B
দেওয়া আছে,
a + b + c = 9
ab + bc + ca = 31
প্রদত্ত রাশি = a² + b² + c²
আমরা জানি,
a² + b² + c² = (a + b + c)² - 2(ab + bc + ca)
= (9)² - 2 × 31
= 81 - 62
= 19
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