The mean proportional between 36 and 121 is equal to:
Let the mean proportional between 36 and 121 be $$x$$
=> $$\frac{36}{x}=\frac{x}{121}$$
=> $$x^2=36\times121$$
=> $$x=\sqrt{36\times121}$$
=> $$x=6\times11=66$$
=> Ans - (C)
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