la-c) 3. Ifa, b, c are in A.P, then...
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la-c) 3. Ifa, b, c are in A.P, then is equal to (6- (A) 1 (B) 2 (C) 3 (D) 4 .

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( a, b, c ) are in ( cos A, p ) ( Rightarrow quad 10=frac{a+c}{2} ) ( mathrm{Now} ) [ begin{aligned} frac{(a-c)^{2}}{b^{2}-a c} &=frac{(a-c)^{2}}{left.left(frac{a+c}{2}right)^{2} cdot a cright)^{2}} &=frac{4(a-c)^{2}}{a^{2}+c^{2}-2 a c} &=frac{4(a-c)^{2}}{(a-c)^{2}}=4 end{aligned} ]
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