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GM of a & b=√(ab)
Checking each option
(i) →(a+b)/(1+1)=(a+b)/2
(ii) →(1+1)/(a^-1+b^-1)=2ab/(a+b)
(iii) →(a^1/2+b^1/2)/(a^-1/2+b^-1/2)= √(ab)
going with options it is -1/2
Checking each option
(i) →(a+b)/(1+1)=(a+b)/2
(ii) →(1+1)/(a^-1+b^-1)=2ab/(a+b)
(iii) →(a^1/2+b^1/2)/(a^-1/2+b^-1/2)= √(ab)
going with options it is -1/2
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