দেওয়া আছে, (a + b + c)2 = a2 + b2 + c2 + 2(ab + bc + ca)
⇒ (9)2 = 29 + 2(ab + bc + ca) ⇒ 2(ab + bc + ca) = 81 - 29 ⇒ 2(ab + bc + ca) = 52 ⇒ ab + bc + ca = 26
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