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If `a`, `b`, `c` are real numbers forming an `A.P.` and `3+a`, `2+b`, `3+c` are in `G.P.` , then minimum value of `ac` isA. `-4`B. `-6`C. `3`D. None of these |
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Answer» Correct Answer - B `(b)` `:. (2+b)^(2)=(3+a)(3+c)` ,brgt `:. 4+b^(2)+4b=9+3(a+c)+ac` `:.4+b^(2)+4b=9+6b+ac` ,brgt `:.ac=b^(2)-2b-5=(b-1)^(2)-6` `:.ac ge -6` |
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