a+b+c=9, a²+b²+c²=29 হলে, ab+ bc+ca এর মান কত?
Solution
Correct Answer: Option C
(a+b+c)²= (a²+b²+c²)+ 2(ab+bc+ca)
⇒ 9²= 29+2(ab+bc+ca)
⇒ 81-29= 2(ab+bc+ca)
⇒ ab+bc+ca= 52/2=26
⇒ 9²= 29+2(ab+bc+ca)
⇒ 81-29= 2(ab+bc+ca)
⇒ ab+bc+ca= 52/2=26
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