1.

If a,x,b are in A.P.,a,y,b are in G.P. and a,z,b are in H.P. such that x=9z and `gt0,bgt0`, thenA. `|y|=3z`B. `x=3|y|`C. `2y=x+z`D. none of these

Answer» Correct Answer - B
x is A.M. of a and b, y is G.M. of a and b ,z is H.M. of and b.
`y^(2)=xz`
Also given,
x=9z
`rArrx=9y^(2)//x`
`rArrx=3absy`


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