1.

A+b+c=10,a²+b²+c²=22 हो तो ab+bc+ca का मान क्या होगा​

Answer»

GIVEN :-

a + b + C = 10

a² + b² + c² = 22

Now,

(a + b + c)² = a² + b² + c² + 2(ab + bc + ca)

(10)² = 22 + 2(ab + bc + ca)

100 - 22 = 2(ab + bc + ca)

ab + bc + ca = 39 ANSWER....



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