.......................qn 11-15 PLS Frnds...............
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:11.ans=16
Step-by-step explanation:
(a+b+c)^2=a^2+b^2+c^2+2ab+2bc+2ca
a^2+b^2+c^2=250
ab+bc+ca=3
2(ab+bc+ca)=2×3
2ab+2bc+2ca =6
(a+b+c)^2=256
a+b+c=16
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