A) 44
B) 22
C) 23
D) 47
Correct Answer: D
Solution :
(d) \[{{\left( a+b+c \right)}^{2}}={{a}^{2}}+{{b}^{2}}+{{c}^{2}}+2\left( ab+bc+ca \right)\] \[144=50+2\left( ab+bc+ca \right)\] \[\therefore ab+bc+ca=\frac{94}{2}=47\]You need to login to perform this action.
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